Check your router settings for "Intrusion Detection" or "SIP ALG" and try disabling them, as they can misidentify game data as a threat.
Ensure you have all required DLCs and mods installed for that specific server. Check your router settings for "Intrusion Detection" or
Go to the Drive tab, then Online . Click the Refresh icon at the bottom of the server list. If the server was recently restarted, it might still be cached as "offline" in your local list. Check your router settings for "Intrusion Detection" or
On Win11, AC sometimes routes through the Xbox Networking stack. Check your router settings for "Intrusion Detection" or