Infinity 1.12.1 server not allowing anyone to join

[gygasync]

Basically the server run was fine, but when a client tries joining it gives the following error

[12:43:45] [Netty IO #2/INFO] [FML]: Attempting connection with missing mods [JourneyMapServer] at CLIENT
[12:44:06] [Server thread/INFO]: gygasync lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[12:44:06] [Server thread/INFO]: gygasync left the game

I've tried swapping config files both server to client and vice versa. Any help would be much appreciated.

 

[DgtlRenegade]

This happens with every client or just you? Verify the version of your server is the same as the version the clients are running off. What message are you getting from your client? Unfortunately, "gygasync left the game" is one of the few errors that tells you absolutely nothing about the issue. (aside from proving your client is connecting to your server so your port is open)

 

[gygasync]

It happens to everyone, technically there is no error just it saying that the client doesn't match mods since then I've downgraded to 1.11.2 and don't have client longs but everything is working fine.