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I have made many servers before and they have always worked but some how now it won't let my friend join even with my firewall off this has become very annoying I need HELP!
Is this from the server or the client and which client? That is important. You will need to add the FTB folder to the antivirus program's exclusions list on which ever machine is experiencing the above error. The error above is caused when an antivirus program becomes over zealous and decides it needs to protect you from those files.
