September 24, 201410 yr If it works in SP check configs. Must be the same on Client an Server. If this doesn't help : remove all mods, clear all configs, and re-add the mods one-by-one to identify the faulty one. If problem still occurs update to 1.7.10 and use latest forge and mod-versions.
September 24, 201410 yr There was a critical exception handling a packet on channel AetherCraft Not a Forge issue.
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