Server starts but can't connect.

[Magnesium Mug]

My server appears to start up just fine, but whenever I try to connect I get 'OnP2PSessionConnectFail: 4'.

relevant logs:

LOG  : Network     , 1653174037935> 60,256,652> *** SERVER STARTED ****
LOG  : Network     , 1653174037935> 60,256,652> *** Steam is enabled
LOG  : Network     , 1653174037936> 60,256,652> server is listening on port 16261
LOG  : General     , 1653174037936> 60,256,653> LuaNet: Initializing...
LOG  : General     , 1653174037936> 60,256,653> LuaNet: Registering server listener...
LOG  : General     , 1653174037936> 60,256,653> LuaNet: Initialization [DONE], triggering events for 'LuaNet.onInitAdd'.
LOG  : Network     , 1653174037937> 60,256,653> DISCORD: token not configured
LOG  : Network     , 1653174037937> 60,256,654> *** DISCORD DISABLED ****
LOG  : General     , 1653174037937> 60,256,654> ##########
Server Steam ID 90159331929346059
##########
LOG  : Multiplayer , 1653174037957> 60,256,674> [MPStatistics] mem usage notification threshold=8,160,437,760
LOG  : General     , 1653174038995> 60,257,712> 1653174038995 znet: OnPolicyResponse
LOG  : General     , 1653174038996> 60,257,712> 1653174038996 znet: Zomboid Server is VAC Secure
LOG  : General     , 1653174112191> 60,330,908> 1653174112191 znet: OnP2PSessionRequest
STEAMPS3 - AsyncTCPSocket created
LOG  : General     , 1653174127291> 60,346,007> 1653174127291 znet: OnP2PSessionConnectFail: 4
STEAMPS3 - AsyncTCPSocket created
STEAMPS3 - AsyncTCPSocket created
STEAMPS3 - AsncTCPSocket destroyed
STEAMPS3 - AsncTCPSocket destroyed
STEAMPS3 - AsncTCPSocket destroyed
STEAMPS3 - AsyncTCPSocket created
LOG  : General     , 1653174172391> 60,391,108> 1653174172391 znet: OnP2PSessionConnectFail: 4
STEAMPS3 - AsyncTCPSocket created
STEAMPS3 - AsyncTCPSocket created
STEAMPS3 - AsyncTCPSocket created
STEAMPS3 - AsncTCPSocket destroyed
STEAMPS3 - AsncTCPSocket destroyed
STEAMPS3 - AsncTCPSocket destroyed
STEAMPS3 - AsncTCPSocket destroyed

my host is running ubuntu 22.04 LTS

here is the result of ss -ltu

pzserver@localhost:~/Zomboid/Server$ ss -ltu
Netid             State              Recv-Q              Send-Q                           Local Address:Port                             Peer Address:Port             Process             
udp               UNCONN             0                   0                                      0.0.0.0:16261                                 0.0.0.0:*                                    
udp               UNCONN             0                   0                                127.0.0.53%lo:domain                                0.0.0.0:*                                    
tcp               LISTEN             0                   4096                             127.0.0.53%lo:domain                                0.0.0.0:*                                    
tcp               LISTEN             0                   128                                    0.0.0.0:ssh                                   0.0.0.0:*                                    
tcp               LISTEN             0                   128                                       [::]:ssh                                      [::]:*

any insights would be greatly appreciated

[Alpharoth]

when i could not connect i had to email the creators, my windows defense was blocking the game. i had to delete it and reinstall and white list the game for windows to play it. not sure if that will help, but a email actually resolved my issue.