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Mods tend to work the same on a LAN world as they do on a server because Minecraft treats any LAN host as a dedicated server. The "fatal error" is most likely being caused by a single mod not interacting properly. Please post crash logs and error messages so we the community can try to solve this problem.

 

An unofficial community for Fabric the Minecraft: Java Edition mod loader. Here you can share your mods and modpacks receive support as a player or as a mod dev ask questions and discuss Fabric!

 

Essential Mod with ATM9! Hey! I am trying to play with friends using Essential mod but when connecting we are having connection issues. Such error is as shown in the picture. Did anyone try to do it before? Anyways to get it to work for example by deleting a mod or two?

 

I made a server for atm 10 and have been able to get into it for the past few weeks but now all of a sudden it wont let me start minecraft I can still start ...

 

The only issue that comes up is every single day after I just played the following day when I try to log onto the server on my main pc I always receive the getsockopt error when trying to join.

 

I also couldn't get lan to work. I got frustrated and decided to just run a full forge server on my desktop since it's got the horsepower for it and now my girlfriend and I can both play on there just fine.