Unable to login using Zoom Linux client and proxy

[ejschwar]

I'm having trouble signing in using Zoom Cloud Meetings 5.16.6 (382) for Linux.  If I sign in with SSO, I am prompted to log in using my browser, and then the Zoom Cloud Meetings client says "Connecting...".  After ~30 seconds, the Zoom client goes back to the login screen and displays "Timeout".

Recording of problem 

I use a proxy, which is configured in the Zoom client.  I have tried various combinations, including manually configuring.

Looking at the connections that are being made by zoom, I see:

~ $ cat /tmp/strace | fgrep connect | fgrep htons 11:53:57
433620 connect(93, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("136.226.18.24")}, 16 <unfinished ...>
433620 connect(93, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("136.226.12.24")}, 16 <unfinished ...>
433619 connect(93, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("136.226.18.24")}, 16 <unfinished ...>
433681 connect(110, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("192.229.211.108")}, 16 <unfinished ...>

136.226.12.24 is our proxy.  129.229.211.108 appears to be part of the edge cast CDN.  So, Zoom appears to be connecting to this address without using the specified proxy.  I can't be sure that this is the cause of the timeout, but it is the best explanation I have at the moment.

Is anyone able to login on Linux with a proxy?

Thanks,

Edward