Hi again,
That is indeed much more clear, unfortunately, what you describe sounds like a bug.
I can’t think of a reason why the proxy would work and the group not work if the other group members work.
I am wondering if there’s anything in the nexus.log at the same time.
However, I feel at this point I’m debugging your problem which I do not feel is the intention of this forum. Feel free to continue to follow up here but my advice is to file a ticket on issues.sonatype.com and include a support zip (documented here: https://help.sonatype.com/display/NXRM3/Support+Features#SupportFeatures-CreatingaSupportZIP) right after you have your issue so we can see the log as well as your config. Tickets on issues.sonatype.com default to non-public by default so any private information will be limited to between you and Sonatype. If that’s still of concern, at least the nexus.log I think will be helpful.
Maybe others have more ideas.
Best,
Joe Tom