So I've been having this issue for almost 15 hours.
Recently I started playing D2 on the trial account and my friend bought the actual game for me this morning. However, I have had connection errors with something like "Buffalo". I've done everything I could think of, I've got no cache, however, I've waited, I've restart the pc, hard shut down, uninstalled/reinstalled, and did a couple things involving discord, because I've heard it can be an issue and I've gotten the same result. Now, my friend has no issues with D2 and I'm very confused.
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There is a post for error codes. Go there find buffalo. Than cry to the forums that your game don’t work