Hello @tridoxx, after reviewing #3712 and this issue report, I think it makes more sense to continue this discussion on the older compatibility report, so I've transferred this issue report to https://github.com/ValveSoftware/Proton/issues/3712#issuecomment-977441036.
proton experimentalx1 2021-11
Compatibility Report
System Information
I confirm:
Symptoms
the multiplayer does not work after the encryption of the new African maps, the error is produced by the proton
Reproduction
this is the error that show proton
crypt:get_gnutls_cipher AES mode 1 with key length 64 not supported wine linux