Mist: listen udp :30303: bind: address already in use

[scyclow]

I definitely don't have any other versions of Mist running, and I've uninstalled & reinstalled. All the solutions I've been able to find related to this issue suggested doing one of those two things.

System information

Node type: geth Network: main Platform: darwin (Architecure x64)

WARN [06-16|14:38:13] No etherbase set and no accounts found as default 
INFO [06-16|14:38:13] Starting peer-to-peer node               instance=Geth/v1.6.5-stable-cf87713d/darwin-amd64/go1.8.3
INFO [06-16|14:38:13] Allocated cache and file handles         database=/Users/pikelny/Library/Ethereum/geth/chaindata cache=1024 handles=1024
INFO [06-16|14:38:18] Initialised chain configuration          config="{ChainID: 1 Homestead: 1150000 DAO: 1920000 DAOSupport: true EIP150: 2463000 EIP155: 2675000 EIP158: 2675000 Metropolis: 9223372036854775807 Engine: ethash}"
INFO [06-16|14:38:18] Disk storage enabled for ethash caches   dir=/Users/pikelny/Library/Ethereum/geth/ethash count=3
INFO [06-16|14:38:18] Disk storage enabled for ethash DAGs     dir=/Users/pikelny/.ethash                      count=2
INFO [06-16|14:38:18] Initialising Ethereum protocol           versions="[63 62]" network=1
INFO [06-16|14:38:18] Loaded most recent local header          number=95419 hash=1142e5…c938a0 td=152146762933695950
INFO [06-16|14:38:18] Loaded most recent local full block      number=0     hash=d4e567…cb8fa3 td=17179869184
INFO [06-16|14:38:18] Loaded most recent local fast block      number=83034 hash=74c0c9…0388f6 td=113044595616850647
INFO [06-16|14:38:18] Starting P2P networking 
Fatal: Error starting protocol stack: listen udp :30303: bind: address already in use

[gpsuser]

from the command line, add the following port definition to the end of your command (choose the port number that is appropriate):
--port "30304"

[scyclow]

Would it make sense to have it try port 30304 if 30303 is already in use? It took me a while to find the command line executable (in /Application\ Support/Ethereum\ Wallet/binaries/Geth/unpacked/geth), which allowed me to do what you're suggesting and then open the application. But that solution was a pain to figure out, and might not be intuitive for a lot of users.

[gpsuser]

I agree -- its always better to not have to configure ports --- but if the default port is in use (firewall ?) there is often no choice but to stipulate an alternative communication port -- otherwise the application wont run

[scyclow]

As far as I can tell, I don't have anything running on 30303.

I've also seen other applications as me if I want to use a different port if the default is in use. Maybe something like that would work?

[evertonfraga]

Hi @scyclow,

please try this: https://github.com/ethereum/mist/wiki#bind-address-already-in-use
I wrote this section of the guide for you – and others that may run into the same problem :)

I'll close this for now, should you need anything, reopen this issue.

[carlgieringer]

Thanks @evertonfraga. Unfortunately the suggestion (for Mac) didn't work for me. When I check for processes bound to 30303, I also get nothing. A couple questions: 1) the error message above (and the one I get from Bitcoin Wallet) mention UDP, but the wiki limits the lsof command to TCP (I checked both, but if it is supposed to be UDP, the wiki should reflect that) 2) does the user need to run the command as a privileged user (with sudo)? (I did so, and still didn't get anything.) Hopefully a system restart will help (when I can get everything saved for a restart!) Thanks!

[nopslip]

Ran into this issue on Sierra 10.12.5. It appears that there is a hung socket. I can see this with:

netstat -an | grep '30303' 
udp46    511      0  *.30303 

but not:
lsof -i tcp:30303
(no results)^^

sudo kill -9 511 
kill: 511: No such process

Unfortunately, I cannot restart my machine (or networking) at this time which I expect would resolve the issue of the hung socket.

Similar to what @scyclow recommend, this approach worked for me to get Geth up and running:

/Users/nopslip/Library/Application\ Support/Ethereum\ Wallet/binaries/Geth/unpacked/geth --port 0

Because I was running Mist I then opened another terminal and ran this which worked:
/Applications/Ethereum\ Wallet.app/Contents/MacOS/Ethereum\ Wallet --mode mist

Hope that helps someone else.

[evertonfraga]

Hi @carlgieringer and @nopslip. You may also want to try this to identify the process. I've udpated the wiki.

lsof -i udp:30303

https://github.com/ethereum/mist/wiki#bind-address-already-in-use

[tystr]

I'm getting this error on OSX as well running version 0.9.0, and nothing is running on port 30303.

Both of the following commands return no matches:

$ lsof -i tcp:30303
$ lsof -i udp:30303

I can start geth from the cli by passing --port 0, but without that it errors with the same address already in use error as mist.

[ZihaoZheng98]

close your mist and then run geth in terminal

[PratikSymz]

How do I close an open port from the terminal on the Mac?
ANSWER
https://stackoverflow.com/questions/12397175/how-do-i-close-an-open-port-from-the-terminal-on-the-mac?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa

[kyriediculous]

@evertonfraga works for me on ubuntu 16.04 , thanks so much !