@Kelt, the “Checking for Version” and the “Battle.net is not responding” errors are both known errors caused by temporary restrictions. Checking on our end, it does appear that one was applied until the morning of June 5th.
It looks like a VPN or Proxy was the cause, please check our temporary restrictions article for more details on what can cause a temporary restriction.
Please keep in mind that these restrictions are not intended as a punishment, but to help keep the servers stable.
@Jlarocque, many security applications now come with VPNs automatically and may cause temporary restrictions with Diablo II. It’s important to make sure these services are disabled before playing Diablo II.
It does appear that a temporary restriction was applied and should be lifted on the morning of June 10th. The cause does appear to be caused by a VPN/Proxy service that was active.
With the game as old as it is, there’s no way to remove temporary restrictions once applied. Our post gives a bit more informatino and details on temporary restrictions.