Hey iCeDraon ,
Maybe this will help .
You will perhaps have the same issue like the most people do . Funny part is they know it and they don’t anything to solve this General issue that block’s the ISP . Here in belgium we are using TELENET as ISP . and don’t ask me why but the devloppers of diablo2 team block that ISP for all people that are using TELENET.
They really need to solve this big issue . maybe you can try to connect with the hotspot of youre phone but turn off the wifi ^^ . if this work then i’m sure youre ISP is also blocked ^^ Join The club 
Anyway here my post " Diablo 2 Still not working in belgium ! Fix this "
grtzz