the only thing i haven't really tryed is reinstalling Arma 3 cause i don't think it does anything because the base game and Epoch are working fine. i even reinstalled Exile at this point, still same problem.
your points:
Poor/problems with internet connection = nope i have 14k wich is more than enough to play any game and i can join and play every Server that isn't Exile even Epoch Servers
Highly fragmented HDD = i have a SSD
Slow CPU = i play alot of games and they are all working well at high settings.
Tons of background processes running = nothing running. only Steam, Teamspeak and Arma 3
Virus/Malware = just checked with Avast and Windows Defender, nothing found.
<= 4gb Of RAM = i only have 6 (or 8 i am not even sure) but as i said its enough to play on every server that isn't running Exile.
Defective hardware = i play alot and every game just like every other Arma 3 Mod/base game is working perfectly fine.
"Blacklisted player possibly?" not sure how this should have happend, i don't cheat and never even typed something in chat.
i also did the "-checkSignatures" for Arma in Steam btw
the strange thing is: i played the Mod for 2 Days after i installed Arma 3 without the problem, one morning i woke up and it didn't work.
thanks alot for the fast reply but i still can't play Exile
but if you guys really think it helps i guess i can reinstall Arma 3, do have to Download all the mods again if i delete Arma though Steam or how does it work?