Setting "client ipc signing = auto" indeed corrected the problem, and I was able to join the file server back to the domain. This may be a fix for others with the particular issue I have.
However, I now have a slightly different issue. This one involved users being denied access to restricted network shares. However, if the share is wide open, there are no problems. This was not a problem prior the upgrade. I'm working through it now and will try to decide where to post about it as I find more.
Richard,
Setting "client ipc signing = auto" indeed corrected the problem, and I was able to join the file server back to the domain. This may be a fix for others with the particular issue I have.
However, I now have a slightly different issue. This one involved users being denied access to restricted network shares. However, if the share is wide open, there are no problems. This was not a problem prior the upgrade. I'm working through it now and will try to decide where to post about it as I find more.
Thanks!