So I'm getting this same error and unfortunately this thread doesn't contain a solution, so hopefully re-posting will get an answer on how to resolve. There's no detail to the error message to help guide on how to solve it, and it doesn't take you any further to allow attempting to re-enter any information. This is occurring on my observatory PC that I'd been using with no problems previously. It should be running the license key generated on my desktop machine where I do my final processing. My interpretation from this post and the message is that it's trying to connect to the PixInsight server and do something. Unfortunately there's no way to tell what it's trying to do. It's also on my remote observatory where internet access is already limited.
Thanks for any guidance,
Beo