Botframework-emulator: Emulator not working on corporate PC starting with version 4.4.0

[martinoss]

Version

4.6.0

Describe the bug

On our corporate machines (behind proxy), my team is locked on using version 4.3.3.
Using this version, we are able to connect to our local bot without an issue. With newer versions, messages from the bot are not displayed in the emulator albeit the log is displaying activity. Additionally we see the warning "Taking longer than usual to connect".

To Reproduce (on corporate machine)

Steps to reproduce the behavior:

1. Start with an echo bot
2. Connect using the emulator > 4.3.3
3. "Taking longer than usual to connect.", no messages

Expected behavior

I expect the emulator to work in our environment also with 4.4.0 and higher versions.

Screenshots

v.4.6.0

v.4.3.3

If applicable, add screenshots to help explain your problem.

Additional context

I know it's hard to reproduce from outside our company, but I would be happy to get some ideas from one of the experts who know what change from 4.3.3 to 4.4.0 could cause such a behavior. Did something change with authentication or are there any requests from outside involved that could be blocked by the firewall? Or did something change with port opening or something like that?
See also #1568.

[bug]

[cwhitten]

Hi @martinoss - we're going to investigate this and report back as to what is happening. This is definitely a bug and we will address it in our first release of the upcoming calendar year 2020.

[martinoss]

Hi @cwhitten, thank you for the good news!

[cwhitten]

@martinoss can you see if the issue remains on the latest release of the Emulator? https://github.com/microsoft/BotFramework-Emulator/releases/tag/v4.7.0

[martinoss]

@cwhitten I just tested it with v4.7.0 and it's now working 🎉 Thank you for the excellent service 👍