I can join to my server but my friends don't

Well, my server has mods and one of them (SecurityCraft) was crashing the server yesterday so I removed it and all works normal except that my friends can't join (Some of them, others can join); this is the log when the server starts: https://mclo.gs/FEaxoDV

Thanks for reading.

The problem is that the log doesn't show errors, it just says that he "timed out"