Cypress: Cypress hangs on CI

[ghost]

I was using cypress 3.4 on the Azure pipeline and it was working fine. The problem started when I upgraded the cypress version to 3.5. The cypress run hangs on the first test suite and doesn't move forward.
I upgraded the cypress version to 3.6 and it was the same.
I am using junit for test reporter and have nothing else special.
Also the cypress test runs fine on my local without any problem.

{
  "reporter": "junit",
  "viewportHeight": 1600,
  "viewportWidth": 1080,
  "reporterOptions": {
    "mochaFile": "./cypress/test-output-[hash].xml",
    "toConsole": true,
    "attachments": true
  },
  "video": false,
  "env": {
    "urlEnv": "staging"
  },
  "chromeWebSecurity": false,
  "pageLoadTimeout": 50000
}

The test suites are quite simple - just a combination of cy.visit and cy.get.type.

[dlabrecque]

Hi,
Same here using 3.6.0 with TeamCity.
I thought maybe video compression was causing an issue so I changed it to false, but it still hangs about once in 3-4 times. I manually have to cancel the run when it happens.
I added DEBUG=cypress:* and attached 2 logs. 1 where it hangs and 1 where it doesn't.
It seems to attempt to close the browser, but it doesn't close properly for some reason.

teamcity_cypress_debug_HANG.log.zip
teamcity_cypress_debug_OK.log.zip

[harvitronix]

I'm having the same problem. 3.4.1 works fine. 3.5.0 and 3.6.1 both hang after starting a test, but not consistently. The log just shows a deleteCookies() call.

[cooleiwhistles]

Having the same problem in 3.6.1 in Jenkins using docker image. Any given spec will hang at random, but the suite works fine in 3.4.1.

[fdaryaee]

Having the same problem with 3.5.0 and 3.6.1, octopus jobs hangs on the very first spec. It works well with 3.4.1.

[jennifer-shehane]

Hey everyone, can you verify what operating system Cypress is hanging on?

Also, capturing and printing the entire set of DEBUG logs may be helpful. Instructions here

[grantspeelman]

Not sure if this is helpful, but our freezing on CircleCI went away when adding "-b chrome" to the run command.

[grantspeelman]

Managed to run the same set of tests locally in run mode and they freeze the same like on CircleCI.

• locally run macos
• circleci is linux docker

Here is a link to log files:
https://gist.github.com/grantspeelman/2e858d78100245fcaa92a8827c0630d8

[harvitronix]

@jennifer-shehane This is happening to me on Ubuntu 18.04.

[mduft]

Same here, working tests with 3.4.1, with 3.6.1 cypress stops at some point and hangs...

[dwelle]

Possibly related to https://github.com/cypress-io/cypress/issues/5475?

[selangley-wa]

Having this issue on Azure Dev Ops. My very simple spec is not using any history.

[selangley-wa]

From what I read in #5558, it might work using Chrome instead of Electron. Anyone try that?

I attempted to build a version of Cypress from source from a date intermediate between the 3.4.1 and the 3.5.0 releases in order to figure out what commit broke it. But I was unsuccessful in building Cypress from source (on Windows 10) - lots of errors that I couldn't solve related to dependent packages.

[9odzilla]

Having the same Issue. Tests team fine on version 3.4.1 but are hanging on the first test on version 3.6.1. using Chrome 78.

[milandebuck]

Having the same issue on Azure Devops Build Agent(Windows 10) Cypress version 3.6.1
I can send the logs via a private message

[EugeneCh]

Confirm hanging on Azure Devops Build Agent Cypress version 3.7.0 (electron 73)

Downgrade to cypress 3.4.1 (electron 61) fixed such problem.

[ttomaszewski]

I'm seeing hanging in CI as well. Will just intermittently fail at a start of another spec file. Not always the same spec file. I downgraded to 3.4.1 but saw the issue there too. When running with DEBUG=cypress* I see it gets hung up at a proxy after a cy.request and the returned response.

[9odzilla]

Just a suggestion, but someone posted in closed issue #5190 passing Chrome arguments prior to execution. I tried this and was able to fix my issues. I determined that pushing '--disable-dev-shm-usage' as a chrome option solved my hanging issue in pipeline execution. Perhaps you guys could try this as well. I am able to now execute all tests using either Chrome or Electron in 3.7 without any hiccups.

[mduft]

I tried again to upgrade from 3.4.1 and it still hangs on 3.7.0. This time I took some time to investigate and also tried --disable-dev-shm-usage (unfortunately did not help).

It hangs /only/ in headless mode, and hangs on any cy.screenshot() call - seemingly forever. When running using cypress open, all our specs run fine without any problem now (which also was not the case for 3.5.x and 3.6.x).

From debug logs I can see this:

2019-12-11T13:44:50.951Z cypress:server:screenshot (s86) capture and check { tries: 1, totalDuration: 0 }
2019-12-11T13:44:50.951Z cypress:server:browsers:electron debugger: sending Page.captureScreenshot with params undefined
2019-12-11T13:45:14.249Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:14.249Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:14.249Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:17.134Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }
2019-12-11T13:45:17.134Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }
2019-12-11T13:45:17.134Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }
2019-12-11T13:45:22.922Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:22.923Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:22.923Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:22.923Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:22.924Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:36247' }
2019-12-11T13:45:31.913Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }
2019-12-11T13:45:31.913Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }
2019-12-11T13:45:31.914Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }
2019-12-11T13:45:31.914Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }
2019-12-11T13:45:31.914Z cypress:https-proxy received error on client browserSocket { err: { Error: write EPIPE at WriteWrap.onWriteComplete [as oncomplete] (internal/stream_base_commons.js:82:16) errno: 'EPIPE', code: 'EPIPE', syscall: 'write' }, url: 'localhost:44769' }

EDIT: I also see the EPIPE during other tests (normal, successful execution), so I guess they are unrelated...

Meanwhile I tried adding --headed argument, and then test succeed with 3.7.0 & Electron - but that defeats the purpose of headless tests somewhat xD. Without --headed they reproducibly hang on cy.screenshot() - BUT: not unconditionally on the first one. It must be some side effect. The setup "normally" is this:

• First spec does not make any screenshots, has 6 tests
• Second spec does not make any screenshots, has 11 tests
• Third spec creates screenshots of a lot of test steps, has 11 tests
• ... more specs ...

It reproducibly hangs on the third spec, first cy.screenshot(). But adding cy.screenshot() to the first or second spec does not cause a hang. The only difference is that the third spec has this:

  beforeEach('Screen resolution', () => {
    cy.viewport(1920, 1080);
  });

Removing the cy.viewport() does, however, not fix the problem!

At this point I'm pretty much lost. If somebody wants to have a look at the three specs I'm talking about, here they are:

1. https://github.com/bdeployteam/bdeploy/blob/master/ui/webapp/cypress/integration/bhive.spec.js
2. https://github.com/bdeployteam/bdeploy/blob/master/ui/webapp/cypress/integration/central-managed.spec.js
3. https://github.com/bdeployteam/bdeploy/blob/master/ui/webapp/cypress/integration/docu.spec.js

I'll keep trying out things to fix it...

EDIT2: Here is the output of the working and not working cy.screenshot() calls from a DEBUG=cypress:* run:

Working (added cy.screenshot('xx') to the first spec):

2019-12-11T14:43:03.874Z cypress:server:socket automation:request take:screenshot { titles: [ 'BHive Browser Tests', 'Check user manifest in default hive' ], testId: 'r3', name: 'xx', capture: 'fullPage', clip: { x: 0, y: 0, width: 1000, height: 660 }, viewport: { width: 1280, height: 720 }, scaled: false, blackout: [], startTime: '2019-12-11T14:43:03.858Z', current: 1, total: 1 }
2019-12-11T14:43:03.875Z cypress:server:screenshot (s12) capturing screenshot { titles: [ 'BHive Browser Tests', 'Check user manifest in default hive' ], testId: 'r3', name: 'xx', capture: 'fullPage', clip: { x: 0, y: 0, width: 1000, height: 660 }, viewport: { width: 1280, height: 720 }, scaled: false, blackout: [], startTime: '2019-12-11T14:43:03.858Z', current: 1, total: 1, specName: 'bhive.spec.js' }
2019-12-11T14:43:03.875Z cypress:server:screenshot (s12) capture and check { tries: 1, totalDuration: 0 }
2019-12-11T14:43:03.875Z cypress:server:browsers:electron debugger: sending Page.captureScreenshot with params undefined
...
2019-12-11T14:43:04.053Z cypress:server:screenshot (s12) received screenshot data from automation layer data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABQAAAALQCAYAAADPfd1WAAAAAXNSR0IArs4c6QAAHMxJREFUeJzt3X
2019-12-11T14:43:04.151Z cypress:server:screenshot (s12) read buffer to image 1280 x 720
2019-12-11T14:43:04.152Z cypress:server:screenshot (s12) helper pixels
 { topLeft: { r: 63, g: 81, b: 181, a: 255, isNotWhite: true },
  topLeftRight: { r: 63, g: 81, b: 181, a: 255, isWhite: false },
  topLeftDown: { r: 63, g: 81, b: 181, a: 255, isWhite: false },
  bottomLeft: { r: 0, g: 0, b: 0, a: 255, isWhite: false },
  topRight: { r: 0, g: 0, b: 0, a: 255, isWhite: false },
  bottomRight: { r: 0, g: 0, b: 0, a: 255, isBlack: true } }
2019-12-11T14:43:04.152Z cypress:server:screenshot (s12) pixelConditionFn { pixelRatio: 1, subject: 'app', hasPixels: false, expectedPixels: false }
2019-12-11T14:43:04.152Z cypress:server:screenshot (s12) no previous image to compare
2019-12-11T14:43:04.152Z cypress:server:screenshot (s12) resolving with image { tries: 1, totalDuration: 0 }
2019-12-11T14:43:04.152Z cypress:server:screenshot (s12) pixel ratio is 1
2019-12-11T14:43:04.152Z cypress:server:screenshot (s12) multi-part 1/1
2019-12-11T14:43:04.152Z cypress:server:screenshot (s12) dimensions before are { x: 0, y: 0, width: 1000, height: 660 }
2019-12-11T14:43:04.153Z cypress:server:screenshot (s12) dimensions for cropping are { x: 0, y: 0, width: 1000, height: 660 }
2019-12-11T14:43:04.153Z cypress:server:screenshot (s12) crop: from 0, 0
2019-12-11T14:43:04.153Z cypress:server:screenshot (s12)         to 1000 x 660
2019-12-11T14:43:04.188Z cypress:server:screenshot (s12) save /ssd/workspaces/deployment/git/deployment/ui/webapp/cypress/screenshots/bhive.spec.js/xx.png

The failing, hanging cy.screenshot('xx') from the third spec:

2019-12-11T14:44:31.533Z cypress:server:socket automation:request take:screenshot { titles: [ 'Creates screenshots for the user documentation', 'Captures Login' ], testId: 'r3', name: 'xx', capture: 'fullPage', clip: { x: 0, y: 0, width: 1000, height: 660 }, viewport: { width: 1280, height: 720 }, scaled: false, blackout: [], startTime: '2019-12-11T14:44:31.525Z', current: 1, total: 1 }
2019-12-11T14:44:31.533Z cypress:server:screenshot (s88) capturing screenshot { titles: [ 'Creates screenshots for the user documentation', 'Captures Login' ], testId: 'r3', name: 'xx', capture: 'fullPage', clip: { x: 0, y: 0, width: 1000, height: 660 }, viewport: { width: 1280, height: 720 }, scaled: false, blackout: [], startTime: '2019-12-11T14:44:31.525Z', current: 1, total: 1, specName: 'docu.spec.js' }
2019-12-11T14:44:31.533Z cypress:server:screenshot (s88) capture and check { tries: 1, totalDuration: 0 }
2019-12-11T14:44:31.533Z cypress:server:browsers:electron debugger: sending Page.captureScreenshot with params undefined

Here is the full log:
cypress-3.7.0.log

[ttomaszewski]

@9odzilla Thanks. I tried --disable-dev-shm-usage but unfortunately that did not help either. Thought it did but after a few test runs I saw the issue again.

[mduft]

Retested all this with 3.8.0. It works now. All hangs, performance degradation, etc. seem to be gone, and headed & headless Electron work fine again (for us!).

[jennifer-shehane]

@valdasgra @dlabrecque @harvitronix @cooleiwhistles @fdaryaee @selangley-wa @9odzilla @milandebuck @EugeneCh

Can everyone try updating to our latest Cypress 3.8.0 version and let us know the results? We fixed a lot of regressions introduced in 3.5.0 and are unaware of any leftover involving CI hanging, so that would be really appreciated.

[9odzilla]

I have upgraded to 3.8.0 and now I randomly get the following error in different tests:

Out of memory. size=4284416
We detected that the Chromium Renderer process just crashed.

I believe 3.7 was not giving me an issue. Executing in docker/azure pipeline using electron.

[9odzilla]

I've added "--ip=host" to my docker container and it is now working without issue.

[harvitronix]

@jennifer-shehane Confirmed upgrading to 3.8.0 solved the random hanging issue for me. Thanks!

[9odzilla]

I've added "--ip=host" to my docker container and it is now working without issue.

This apparently did not fix my issue. It's no longer hanging, but I am getting the renderer just crashed error randomly now.

[DLatheron]

We have the same problem on ubuntu, under Jenkins... upgrading to 3.8.0 did NOT fix the issue... reverted to 3.4.1 seems to.

[dlabrecque]

Not hanging so far on 3.8.0. Thank you for all the effort put into this.

[ngbrown]

For me, the Cypress process on Azure DevOps CI builds (using own Windows Server instance) was working on 3.4.1 would hang after finishing the tests in 3.5, 3.6, and 3.7. It now works on 3.8. Thanks.

[ttomaszewski]

Ran in Jenkins/Docker with DEBUG mode using newest version 3.8.1. This is an error i noticed.

2020-01-02T20:44:37.699Z cypress-verbose:server:video:frames video stream drained
2020-01-02T20:44:37.716Z cypress:proxy:http Entering stage { stage: 'IncomingRequest' }
2020-01-02T20:44:37.716Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'LogRequest' }
2020-01-02T20:44:37.716Z cypress:proxy:http:request-middleware proxying request { req: { method: 'HEAD', proxiedUrl: 'http://ubdwvtpxaejnpn/', headers: { host: 'ubdwvtpxaejnpn', 'proxy-connection': 'keep-alive', 'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36', 'accept-encoding': 'gzip, deflate' } } }
2020-01-02T20:44:37.716Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'RedirectToClientRouteIfUnloaded' }
2020-01-02T20:44:37.716Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'RedirectToClientRouteIfNotProxied' }
2020-01-02T20:44:37.716Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'EndRequestsToBlacklistedHosts' }
2020-01-02T20:44:37.716Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'MaybeEndRequestWithBufferedResponse' }
2020-01-02T20:44:37.717Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'StripUnsupportedAcceptEncoding' }
2020-01-02T20:44:37.717Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'MaybeSetBasicAuthHeaders' }
2020-01-02T20:44:37.717Z cypress:server:server Getting remote state: { auth: null, props: { port: '8080', tld: 'localhost', domain: '' }, origin: 'http://localhost:8080', strategy: 'http', visiting: false, domainName: 'localhost', fileServer: null }
2020-01-02T20:44:37.717Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'SendRequestOutgoing' }
2020-01-02T20:44:37.717Z cypress:server:server Getting remote state: { auth: null, props: { port: '8080', tld: 'localhost', domain: '' }, origin: 'http://localhost:8080', strategy: 'http', visiting: false, domainName: 'localhost', fileServer: null }
2020-01-02T20:44:37.717Z cypress:network:agent addRequest called { isHttps: false, href: 'http://ubdwvtpxaejnpn/' }
2020-01-02T20:44:37.717Z cypress:network:connect beginning getAddress { hostname: 'ubdwvtpxaejnpn', port: 80 }
2020-01-02T20:44:37.718Z cypress:server:stream_buffer stream buffer writeable final called
2020-01-02T20:44:37.718Z cypress:proxy:http Entering stage { stage: 'IncomingRequest' }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'LogRequest' }
2020-01-02T20:44:37.718Z cypress:proxy:http:request-middleware proxying request { req: { method: 'HEAD', proxiedUrl: 'http://pyjvrgazlffdzg/', headers: { host: 'pyjvrgazlffdzg', 'proxy-connection': 'keep-alive', 'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36', 'accept-encoding': 'gzip, deflate' } } }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'RedirectToClientRouteIfUnloaded' }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'RedirectToClientRouteIfNotProxied' }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'EndRequestsToBlacklistedHosts' }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'MaybeEndRequestWithBufferedResponse' }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'StripUnsupportedAcceptEncoding' }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'MaybeSetBasicAuthHeaders' }
2020-01-02T20:44:37.718Z cypress:server:server Getting remote state: { auth: null, props: { port: '8080', tld: 'localhost', domain: '' }, origin: 'http://localhost:8080', strategy: 'http', visiting: false, domainName: 'localhost', fileServer: null }
2020-01-02T20:44:37.718Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'SendRequestOutgoing' }
2020-01-02T20:44:37.719Z cypress:server:server Getting remote state: { auth: null, props: { port: '8080', tld: 'localhost', domain: '' }, origin: 'http://localhost:8080', strategy: 'http', visiting: false, domainName: 'localhost', fileServer: null }
2020-01-02T20:44:37.719Z cypress:network:agent addRequest called { isHttps: false, href: 'http://pyjvrgazlffdzg/' }
2020-01-02T20:44:37.719Z cypress:network:connect beginning getAddress { hostname: 'pyjvrgazlffdzg', port: 80 }
2020-01-02T20:44:37.719Z cypress:server:stream_buffer stream buffer writeable final called
2020-01-02T20:44:37.720Z cypress:proxy:http Entering stage { stage: 'IncomingRequest' }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'LogRequest' }
2020-01-02T20:44:37.720Z cypress:proxy:http:request-middleware proxying request { req: { method: 'HEAD', proxiedUrl: 'http://nwowdrxskon/', headers: { host: 'nwowdrxskon', 'proxy-connection': 'keep-alive', 'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36', 'accept-encoding': 'gzip, deflate' } } }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'RedirectToClientRouteIfUnloaded' }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'RedirectToClientRouteIfNotProxied' }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'EndRequestsToBlacklistedHosts' }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'MaybeEndRequestWithBufferedResponse' }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'StripUnsupportedAcceptEncoding' }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'MaybeSetBasicAuthHeaders' }
2020-01-02T20:44:37.720Z cypress:server:server Getting remote state: { auth: null, props: { port: '8080', tld: 'localhost', domain: '' }, origin: 'http://localhost:8080', strategy: 'http', visiting: false, domainName: 'localhost', fileServer: null }
2020-01-02T20:44:37.720Z cypress:proxy:http Running middleware { stage: 'IncomingRequest', middlewareName: 'SendRequestOutgoing' }
2020-01-02T20:44:37.720Z cypress:server:server Getting remote state: { auth: null, props: { port: '8080', tld: 'localhost', domain: '' }, origin: 'http://localhost:8080', strategy: 'http', visiting: false, domainName: 'localhost', fileServer: null }
2020-01-02T20:44:37.720Z cypress:network:agent addRequest called { isHttps: false, href: 'http://nwowdrxskon/' }
2020-01-02T20:44:37.720Z cypress:network:connect beginning getAddress { hostname: 'nwowdrxskon', port: 80 }
2020-01-02T20:44:37.721Z cypress:server:stream_buffer stream buffer writeable final called
2020-01-02T20:44:37.737Z cypress:network:connect error getting address {
  hostname: 'ubdwvtpxaejnpn',
  port: 80,
  err: OperationalError: getaddrinfo ENOTFOUND ubdwvtpxaejnpn
      at GetAddrInfoReqWrap.onlookupall [as oncomplete] (dns.js:72:26)
   {
    cause: Error: getaddrinfo ENOTFOUND ubdwvtpxaejnpn
        at GetAddrInfoReqWrap.onlookupall [as oncomplete] (dns.js:72:26)
     {
      errno: 'ENOTFOUND',
      code: 'ENOTFOUND',
      syscall: 'getaddrinfo',
      hostname: 'ubdwvtpxaejnpn'
    },
    isOperational: true,
    errno: 'ENOTFOUND',
    code: 'ENOTFOUND',
    syscall: 'getaddrinfo',
    hostname: 'ubdwvtpxaejnpn'
  }
}
2020-01-02T20:44:37.738Z cypress:network:agent got family { family: undefined, href: 'http://ubdwvtpxaejnpn/' }
2020-01-02T20:44:37.741Z cypress:network:connect error getting address {
  hostname: 'nwowdrxskon',
  port: 80,
  err: OperationalError: getaddrinfo ENOTFOUND nwowdrxskon
      at GetAddrInfoReqWrap.onlookupall [as oncomplete] (dns.js:72:26)
   {
    cause: Error: getaddrinfo ENOTFOUND nwowdrxskon
        at GetAddrInfoReqWrap.onlookupall [as oncomplete] (dns.js:72:26)
     {
      errno: 'ENOTFOUND',
      code: 'ENOTFOUND',
      syscall: 'getaddrinfo',
      hostname: 'nwowdrxskon'
    },
    isOperational: true,
    errno: 'ENOTFOUND',
    code: 'ENOTFOUND',
    syscall: 'getaddrinfo',
    hostname: 'nwowdrxskon'
  }
}
2020-01-02T20:44:37.741Z cypress:network:agent got family { family: undefined, href: 'http://nwowdrxskon/' }
2020-01-02T20:44:37.762Z cypress:server:request received an error making http request { timeout: 60000, retryIntervals: [ 0, 100, 200, 200 ], url: 'http://nwowdrxskon/', requestId: 'request528', retryOnNetworkFailure: true, retryOnStatusCodeFailure: false, delaysRemaining: [ 0, 100, 200, 200 ], err: Error: getaddrinfo ENOTFOUND nwowdrxskon at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26) { errno: 'ENOTFOUND', code: 'ENOTFOUND', syscall: 'getaddrinfo', hostname: 'nwowdrxskon' } }
2020-01-02T20:44:37.762Z cypress:server:request retrying request { timeout: 60000, retryIntervals: [ 0, 100, 200, 200 ], url: 'http://nwowdrxskon/', requestId: 'request528', retryOnNetworkFailure: true, retryOnStatusCodeFailure: false, delaysRemaining: [ 100, 200, 200 ], delay: 0, attempt: 1 }
2020-01-02T20:44:37.763Z cypress:server:stream_buffer buffered stream EOF { readerId: 'reader529' }
2020-01-02T20:44:37.763Z cypress:network:agent addRequest called { isHttps: false, href: 'http://nwowdrxskon/' }
2020-01-02T20:44:37.763Z cypress:network:connect beginning getAddress { hostname: 'nwowdrxskon', port: 80 }

Any idea on the random hostnames?

[ghost]

@jennifer-shehane Upgraded the cypress version to 3.8.2 and it fixed the issue!
Thanks!

[jennifer-shehane]

This issue will be closed to further comment as the exact issue here was resolved and tested.

If you're experiencing a bug similar to this in Cypress, please open a new issue with a fully reproducible example that we can run. There may be a specific edge case with the issue that we need more detail to fix.