MTA:SA error code
MTA:SA error CC34
The networking library on your client and on the server are different versions.
How to fix it
Close MTA completely
Close the game before you update MTA’s files.
Source: MTA help
Install the current official release
Get the current MTA installer from its official site and finish the installation. The official guide for this error says a newer MTA may fix it.
Source: MTA help, MTA download
Connect again, then compare with another server
Connect again. If the error is still there, try another server you trust to compare. Then report the exact protocol message and the MTA build you have installed. Do not change your account password or your serial to try to fix a protocol mismatch.
These are the steps of the guide Disconnected by an unknown protocol error.
Still not fixed? Copy the whole message, not only the code, and check your log in the Fix tool. It is read on your own computer.
About this code
This is the usual sign of an out-of-date client, or of a server running a different MTA branch.
MTA's own client shows a CC code when something fails before or during a connection: the address, the nickname, a module it could not load, or the connection itself. MTA's own documentation gives CC34 as RakNet protocol mismatch.
All fix guides · Every MTA:SA error code · Crash codes and offsets
Where this comes from
- github.com/multitheftauto/mtasa-blue/blob/master/Client/core/CConnectManager.cpp
- help.multitheftauto.com/sa/trouble/protocol-error/
- multitheftauto.com/
Read on 5 September 2026 and written in our own words here.