Hey,
since the latest Rust / Oxide Update we had connection Problems with the following error in the log

and here is the client message:


here is the oxide.log file

13:02 [Info] Loading Oxide Core v2.0.3982...
13:02 [Info] Loading extensions...
13:02 [Info] Loaded extension CSharp v2.0.4019 by Oxide Team and Contributors
13:02 [Info] Loaded extension Rust:IO for Oxide v2.17.0 by playrust.io / dcode
13:02 [Info] Loaded extension MySql v2.0.3758 by Oxide Team and Contributors
13:02 [Info] Loaded extension Rust v2.0.4516 by Oxide Team and Contributors
13:02 [Info] Loaded extension SQLite v2.0.3760 by Oxide Team and Contributors
13:02 [Info] Unity version: 2019.3.5f1
13:02 [Info] Loaded extension Unity v2.0.3774 by Oxide Team and Contributors
13:02 [Info] Latest compiler MD5: 5fbca0bf39b1c09ddf2fb3686b869242
13:02 [Info] Local compiler MD5: 0
13:02 [Info] Compiler MD5 hash did not match, downloading latest
13:02 [Info] Downloading Compiler.exe for .cs (C#) plugin compilation
13:02 [Info] Local MD5 hash did not match remote MD5 hash for Compiler.exe, attempting download again
13:02 [Info] Latest compiler MD5: 5fbca0bf39b1c09ddf2fb3686b869242
13:02 [Info] Local compiler MD5: 5fbca0bf39b1c09ddf2fb3686b869242
13:02 [Info] Using Covalence provider for game 'Rust'
13:02 [Info] Loading plugins...
13:02 [Info] Loaded plugin Rust v2.0.4516 by Oxide Team and Contributors
13:02 [Info] Loaded plugin Unity v2.0.3774 by Oxide Team and Contributors
13:02 [Info] Loaded plugin Rust:IO for Oxide v2.17.0 by playrust.io / dcode
13:04 [Info] IP address from command-line: 94.250.216.160
13:04 [Info] Updating Rust:IO ...
13:04 [Info] Rust:IO: Update complete
13:04 [Info] Installing Rust:IO ...
13:04 [Info] Rust:IO> Setting up Rust:IO 2.3.7373.16023 ...
13:04 [Info] Rust:IO> Creating directories ...
13:04 [Info] Rust:IO> Applying config ...
13:04 [Info] Rust:IO> Initializing database ...
13:04 [Info] Rust:IO> Generating map image (this may take a while) ...
13:04 [Info] Rust:IO> Generation complete
--------- Summary --------
Render       :  3376.848ms
Postprocess  :  1749.730ms
  Shadows    :   115.486ms
  FXAA       :  1592.345ms
Encoding     :    43.935ms
Other        :    62.621ms
--------------------------
Total        :  5233.134ms
13:04 [Info] Rust:IO> Starting HTTP server on 94.250.216.160:28015 ...
13:04 [Info] Rust:IO> Installed.
13:04 [Info] Rust:IO> Now ticking
13:04 [Warning] Calling 'OnTick' on 'RustIO v2.17.0' took 6176ms [GARBAGE COLLECT]
13:04 [Warning] Calling 'OnTick' on 'RustIO v2.17.0' took average 63ms [GARBAGE COLLECT]
13:04 [Info] Rust:IO> External IP address obtained from lookup: 78.143.41.88
13:06 [Info] Loading Oxide Core v2.0.3982...
13:06 [Info] Loading extensions...
13:06 [Info] Loaded extension CSharp v2.0.4019 by Oxide Team and Contributors
13:06 [Info] Loaded extension MySql v2.0.3758 by Oxide Team and Contributors
13:06 [Info] Loaded extension Rust v2.0.4516 by Oxide Team and Contributors
13:06 [Info] Loaded extension SQLite v2.0.3760 by Oxide Team and Contributors
13:06 [Info] Unity version: 2019.3.5f1
13:06 [Info] Loaded extension Unity v2.0.3774 by Oxide Team and Contributors
13:06 [Info] Latest compiler MD5: 5fbca0bf39b1c09ddf2fb3686b869242
13:06 [Info] Local compiler MD5: 5fbca0bf39b1c09ddf2fb3686b869242
13:06 [Info] Using Covalence provider for game 'Rust'
13:06 [Info] Loading plugins...
13:06 [Info] Loaded plugin Rust v2.0.4516 by Oxide Team and Contributors
13:06 [Info] Loaded plugin Unity v2.0.3774 by Oxide Team and Contributors
13:07 [Info] IP address from command-line: 94.250.216.160

Error on connection:

MissingFieldException: Field 'ProtoBuf.PlayerState.deathMarker' not found.
at BasePlayer.SendMarkersToClient () [0x00011] in <f90850a2488b4d8186e3e27d060efdb0>:0
at BasePlayer.Server_RequestMarkers (BaseEntity+RPCMessage msg) [0x00000] in <f90850a2488b4d8186e3e27d060efdb0>:0
at BasePlayer.OnRpcMessage (BasePlayer player, System.UInt32 rpc, Network.Message msg) [0x00f59] in <f90850a2488b4d8186e3e27d060efdb0>:0
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
BasePlayer:OnRpcMessage(BasePlayer, UInt32, Message)
BaseEntity:SV_RPCMessage(UInt32, Message)
ServerMgr:OnRPCMessage(Message)
ServerMgr:OnNetworkMessage(Message)
Facepunch.Network.Raknet.Server:ConnectedPacket(Connection)
Facepunch.Network.Raknet.Server:Cycle()
ServerMgr:Update()

(Filename: <f90850a2488b4d8186e3e27d060efdb0> Line: 0)

SideNote: when we remove Oxide its working.

Make sure you are running the latest client and server version, also try to unload all plugins and uninstall rust io (remove plugins from /oxide/plugins)

You are not running both the latest Rust and latest Oxide if you see errors like this. These errors happen when you mixed Rust versions (what Rust provides and the patched files that Oxide provides).