Failed To Authenticate

Since I installed Diablo 2 Resurrected a couple of weeks ago, I’m frequently unable to play online. Some days I can get in fine, but most days I get a “Failed To Authenticate” message whenever I try to play an online character. I’m definitely online. None of my other games have problems connecting to their servers. My wife, sitting ten feet away from me on her own laptop, can play online D2:R games just fine, all the time, even when I can’t.

I see some error text in blz-log.txt:

3/26 11:53:58.245  [D2BackendServices/4] [<>:0]: D2BackendServices: error: 666 Error Source: 0 Error Value: 666 String: An issue occurred while communicating with the game servers. Please check that you are connected to the internet and try again.
3/26 11:54:03.228  [line.m_sourceName.c_str()/3] [:0]: Failed to process websocket: 1
3/26 11:54:06.511  [BGSEnvironmentMap/4] [<>:0]: Environment Status: PROD - us.actual.battle.net - Release
3/26 11:54:07.819  [D2BackendServices/4] [<>:0]: Got error with no error code. BackendResponseType: 1 BackendErrorResult: 2

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