On Fri, Nov 20, 2020 at 6:37 PM Gordon Messmer <gordon.messmer at gmail.com> wrote: > > On 11/20/20 1:26 PM, Michael B Allen wrote: > > Thanks for the inputs but my problem has nothing to do with NFS. > > > Do you think that because you saw "krbupdate" in /etc/services? > > The problem you've described is definitely an NFSv3 problem. The > connections causing the client to hang are portmap connections. They're > dynamic, and don't necessarily conform to /etc/services. > > The lesson to learn, here, is that /etc/services maps names to numbers, > but it does NOT map numbers to names. Port numbers aren't reserved > simply because there is a mapping to them in /etc/services. Hi Gordon, You're right! My mistake. I removed the Source Port rule and did the following instead: # firewall-cmd --add-service=nfs3 --permanent # firewall-cmd --reload This fixed the hanging issue (and probably other stuff I haven't run into yet). So even though NFS worked fine just doing the usual file related ops in a terminal, apparently my client is old enough that it's still doing NFSv3 whereas CentOS 7 has moved on to NFSv4 and that incompatibility was responsible for the desktop / libreoffice hanging issue. Much thanks. Mike