gus_23 GU
@gus_23
Minecraft Oct 30, 2026

ReadTimeoutException when joining a modded Minecraft server

Server starts fine but every time I try to log in I get 'exception connecting: ReadTimeoutException : null'. Same modpack on both sides, 8GB of RAM allocated. Friends get kicked the same way. Where would you start looking?
readtimeoutexception minecraft server
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anitad Nov 04, 2026
gus_23
That timeout usually means the server is still sending your client the mod data and Forge gives up before it finishes. Two things fix most cases. First, add -Dfml.readTimeout=180 to your JVM arguments in the launcher profile (and ask the server owner to add it too) so it waits longer. Second, check your mod list matches the server exactly, same versions, a mismatch can show up as a timeout instead of a clear error. Low RAM allocated to the client can do it on big packs as well.
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