[1.16.5] Can't connect to my own server

[CaptainSoulo]

Hello everyone,

I'm currently in the works of developing my own modpack and while everything seemed all fine, I attempted to join a server I made on my own machine to test with some friends. When I attempt to join I receive the following errors on both ends:

Quote

Server:
[20:19:34] [Netty Server IO #1/WARN] [ne.mi.fm.ne.FMLStatusPing/]: Heuristically truncating mod and/or network channel list in server status ping packet. Compatibility report in the multiplayer screen may be inaccurate.
[20:19:37] [Netty Server IO #2/INFO] [co.li.co.ConfigSyncManager/]: Skipping config sync, No mods have registered a syncable config.

Quote

Client:
Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: Index: 25, Size: 5

I've already toyed around with Forge versions between latest and previous version (36.2.2 to 36.2.0) on both client and server, same result. Mods are hard to remove and replace without knowing if and what mods are at fault, and I've also tried multiple sets of server arguments. This attempt is without any arguments on server. Also verified that all mods are the same on both client and server.

I'm attaching client latest.log and server debug.log. If there's any other information that's needed to help me resolve this, please let me know.

Thanks!

debug.log from Server

latest.log from Client
 

[CaptainSoulo]

13 hours ago, diesieben07 said:

These are not errors.

The server log doesn't seem to show anyone even connecting. It ends before the client log even shows the connection attempt.
The client log shows this:

But at least spartanshields is installed on the server. So to me it looks like you joined a different server or you posted the wrong log files.

Also please post the debug.log from the client, not latest.log.

Here is the debug.log from client the times will vary but the response from the server is exactly the same.

As soon as I attempt to connect, it responds with "Skipping config sync, No mods have registered a syncable config." and an error screen pops up on client with: "Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: Index: 25, Size: 5"

I can confirm this is the correct server as I've attempted this on my network locally with the same result. The quote with the server response is from an older attempt (as well as the new debug.log from Client)

[CaptainSoulo]

4 hours ago, diesieben07 said:

Not sure what else to say here. The "Internal Exception" you mentioned does not appear in the log.

The “Internal Exception” would only appear on the client as an error screen but not appear in any logs. However I was able to solve this on my own. It turns out ScalingHealth was the cause here.

Upon removing it the server allowed me to connect again. Thank you for your time.