Can’t login to Battle.net on US West server (Diablo 2)

Hi, I recently back to Diablo 2 and play on US west server.
I sometimes played on café with laptop rather than play it on home.
Today, I found that I cannot log on to US west server.
I tried install and reinstall again, firewall setting, and registry editing, but any of them solved problem.
I wonder if it is issue with server (ex: server down) or related to my account.