C04T00R14X-01 / Multiplatform solved

[ChatOmnivore354]

Hi everyone,

I’m still unable to play multiplayer on Age of Empires IV (Steam version).

When I try to access Multiplayer, I get:

Multiplatform error
Code: C04T00R14X-01

Hi everyone,

I’m still unable to play multiplayer on Age of Empires IV (Steam version).

When I try to access Multiplayer, I get:

Multiplatform error
Code: C04T00R14X-01

Here’s what I’ve already verified:

• Steam is online

• Game build is up to date (15.3.8338.0)

• Game files verified

• Windows Firewall allows RelicCardinal.exe (Private + Public)

• Xbox services are running (XblAuthManager, XboxNetApiSvc)

• Teredo status = qualified

• UPnP enabled on router

• Required ports manually opened (3074, 3544, 3478, 5222, 8888, 9999)

[ChatOmnivore354]

j’a

I solved the issue on my side.

What worked:

• Removed all mods (even disabled ones)

• Deleted Steam launch options:

  -nomovie -dev
  
  

• Ran (as Admin):

  netsh winsock reset
  netsh int ip reset
  ipconfig /flushdns
  
  

After rebooting, multiplayer worked again.

In my case, it was related to modding/dev mode.

Hope this helps.