Hello @XXXBold, please give #5612 a read and let us know if that's the issue you've encountered.
Not sure if it's the same issue, I've set my timezone to America/Argentinia Buenos Aires to test if it will fix the issue (My default is Europe, Zurich), but no change. Are there any specific Information I can provide to help you?
Edit:
I also tried to launch steam using steam -nochatui -nofriendsui as mentioned in #5612 but it doesn't have any visible effect and doesn't solve the issue.
Edit2:
Also tried to delete the config folder within the Steam installation to get rid of local data, but no change, problem persists.
Just updated to new Client (06 Dec. 2019, 03:31:00), still no change.
Update: New Client (16. Dec. 2019, 16:49:05), no change.
I've built a new Machine for gaming, including a complete re-installation of the OS (Now on: Linux Mint 19.3, with Kernel 5.3) and all Software as well. I was pretty sure this would "fix" the problem, but no, it's still there.
Are there any steps I can do to locate the issue? Could this be an issue specific to my account?
Seems the issue is gone since a week or so, without any reason (No Client-update involved) and didn't occur again. Since I cannot reproduce this and have no idea what caused it, I'll close this for now.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
Connection to friend's network can't be established, but Internet connection is okay.

If I go to my profile in Steam, I can see the friend list and that some of them are online, but I can't connect in the friend's list. Also I cannot read/write any chat messages, even if I can see that there are some unread ones.
Friendlist:
Viewing my profile in the steam client:

If I launch steam from the console, and click on "Erneuter Verbindungsversuch" (Try Reconnect) on the friendlist window, following lines are output in console:
[1130/211743.392395:ERROR:ssl_client_socket_impl.cc(941)] handshake failed; returned -1, SSL error code 1, net_error -200 [1130/211743.480280:ERROR:ssl_client_socket_impl.cc(941)] handshake failed; returned -1, SSL error code 1, net_error -200 [1130/211743.577775:ERROR:ssl_client_socket_impl.cc(941)] handshake failed; returned -1, SSL error code 1, net_error -200Steps for reproducing this issue: