Can not localhost a port-forwarded server (thaumcraft problem?)

[Rockon]

Me and a friend want to play on a server that I've been trying to host, and I had a lot of issues, but I finally figured out how to port forward the serve, and just as I was signing in from localhost, I got a message saying "Forge mod loader has found world ID mismatches" then a whole line of thuamcraft blocks that are missing. e.g. "ID 1609 (modID: thuamcraft, typeblockJar) is missing" finally after the list of those missing blocks, it says "You cannot connect to this server" Please help me out here, how do I fix this problem. I'm so close to finally getting this server working, its been months since I started trying to do this.

 

[greatshooter]

reinstall the client and redownload the server files, must be related to configs.

 

[Rockon]

Will I lose my single player save data in doing that? also, I've downloaded the server info about 13 times already, would all 13 times have the same problem if it was the config files causing the problem

 

[Moasseman]

Will I lose my single player save data in doing that? also, I've downloaded the server info about 13 times already, would all 13 times have the same problem if it was the config files causing the problem

Take backups. Daily. Hourly. I'm not even kidding, that one time you think like "meh CBA to take backups nothing's gon' happen" and then the server crashes and world gets 105% corrupted you're gonna kick yourself in the nuts. Multiple times. Within a small timeframe.

 

[Rockon]

Ok, I do backup once every couple weeks. Ill do it more often.