The issues related to logging in to the European PC/Mac megaserver have been resolved at this time. If you continue to experience difficulties at login, please restart your client. Thank you for your patience!
Time out in lobby or some such. Then the insult of Error 304 saying account already logged in !! This has been happening far too often recently
Had the exact same problem, took me two weeks of work figuring out the problem and even reinstalling my PC fresh. I've just managed to solve it today - a couple hours ago. If your issue persists and the game becomes unplayable try these:
1) If I may advise you, check with your ISP (provider) first and make sure your router is set up correctly, did not go through recent hightened security update or isn't outdated.
Complain about streaming and games disconnecting and cutting off every 5 minutes or so, they should then help you set it up correctly.
- This was a part of the issue on my side. The rest is on ESO's side.
2) Use Repair game option in the launcher.
3) Next step is disabling all add-ons (better to remove the folder entirely), running the game fresh and then re-add all of them 1 by 1 carefully. Their new client coding does not bode well with some outdated add-ons.
4) Also open your launcher's folder and remove ProgramData folder.
5) Make sure your network card has the latest drivers!!!
6) Perform a DNS flush and network reset:
(Open command prompt and then type in)
a) netsh int ip reset C:\resetlog.txt press Enter
b)netsh winsock reset press Enter
c)ipconfig /flushdns press Enter
7) Restart computer.
If the steps above do not help, repeat the process, only this time uninstall the game entirely and remove ALL remnants of the game's files first. Then perform a fresh install.
You might also wanna try a TCP booster, this did not only help me fix the issue for good, it also boosted my PvP performance immensely.