Steam Networking stopped working on GoldSrc games supporting multiplayer.

[Evisneffo]

Everything worked fine from November 2023 until September 2024 (I'm not sure exactly when it stopped working, I just last played in September 2024). Now, when creating a map with Steam Networking enabled, people cannot connect to me, and I cannot connect to others.

Below are the game console logs:

Usage:
Setmaster unavailable, start a server first.
NET Ports:  server 27015, client 27005
couldn't exec maps/crossfire_load.cfg
FakeIP enabled! Requesting a fake IP.
[SteamNetworkingSockets] SDR network config fetch attempt #1 failed.  HTTP 504.  .  Trying again.
Connection to Steam servers successful.
FakeIP allocation succeeded: 169.254.9.114:33728
Using FakeIP
Server IP address 169.254.9.114:33728
   VAC secure mode is activated.

BUILD 10210 SERVER (0 CRC)
Server # 1
Evisneffo has joined the game