After trying almost everything, this is my last attempt.
I decided a couple of days ago to start playing the game again and I noticed that, the most time I got in the game, the lagger it went.
I renewed my pc half a month ago and I don't have problems with other games. I got my graphics driver up to date and everything.
Today, trying to solve that lag issue I re-installed the game and now this message appears when I try to log in with any of my characters: Unable to connect to the server. Please make sure you have a valid internet connection.
Just in case I opened TESO ports on the router. I tried to start the game without the Avast Firewall or the antivirus. I made sure I had all TESO exe archives with administrator privileges. I repaired the game, downloaded it again and installed it again and I tried to eliminate addons and User settings. All the other games (Fortnite, Secret World Legends, FFXIV...) and also internet goes perfectly. I got a 120 mbs cable internet connection with perfectly stable ping and as far as I know, the server (EU PC, non-steam version) isn't down.
I tried everything with no results so... anything that could help is very much appreciated.
My pc specs are:
Win 10 Home 64 bits
AMD Ryzen 7 - 1700
16 g. ram
AMD Radeon RX 570 8gb VRAM