Hi,
My issue (which usually gives a 'connection refused') is certainly reproducable - just not 100% of the time. Right now, the client is refusing to connect, but I bet if I try in 10 minutes, it'll work. Sometimes it fails right away, sometimes it's stuck for a minute or 2 logging in.

I ran a traceroute on api.faforever.com:

traceroute api.faforever.com
traceroute to api.faforever.com (116.202.155.226), 30 hops max, 60 byte packets
 1  OpenWrt.lan (192.168.1.1)  0.385 ms  0.369 ms  0.446 ms
 2  192.168.2.1 (192.168.2.1)  1.328 ms  1.458 ms  1.520 ms
 3  p3e9bf094.dip0.t-ipconnect.de (62.155.240.148)  5.900 ms  5.882 ms  5.996 ms
 4  n-ea9-i.N.DE.NET.DTAG.DE (217.5.75.90)  25.070 ms  25.247 ms  25.039 ms
 5  62.157.248.138 (62.157.248.138)  17.401 ms  17.385 ms  17.509 ms
 6  core23.fsn1.hetzner.com (213.239.252.246)  30.588 ms  28.461 ms core24.fsn1.hetzner.com (213.239.252.250)  18.777 ms
 7  ex9k1.dc1.fsn1.hetzner.com (213.239.245.234)  18.582 ms ex9k1.dc1.fsn1.hetzner.com (213.239.245.230)  19.002 ms ex9k1.dc1.fsn1.hetzner.com (213.239.245.234)  19.988 ms
 8  * * *
 9  * * *
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12  * * *
13  * * *
14  * * *
15  * * *
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17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *

Seems somehow along the way, I do get blocked, and it's not my computer or network doing the blocking. Yet https://downforeveryoneorjustme.com/api.faforever.com says the server is up, so it's my ip that gets blocked perhaps?

Just now, the client logged in, but then is stuck in a weird limbo way:

As I otherwise have no network issues, it does seem there's something in the faf client or server. I now have a hanging client, so there's that. After killing it - it logs in without issues. Traceroute still gives the same outcome.

It all seems magic to me

If there's anything I can run locally to help track down the issue, just let me know.