At last week's MUUG meeting, I mentioned problems I had encountered with Fedora 16, dealing with NIS and autofs.
The first one was that supplementary groups defined via NIS (or LDAP, as it turns out) were being ignored (whereas those in /etc/group were not). The solution was simply to comment out the "initgroups" map line in the /etc/nsswitch.conf file...
Bug 750388 - Authconfig needs to handle new 'initgroups' nsswitch map (was: secondary groups not populated) https://bugzilla.redhat.com/show_bug.cgi?id=750388
The second one was that the autofs service wasn't waiting for ypbind to start, so there was a race condition that would cause NFS mount points published in NIS automounter maps to be ignored. Some solutions were proposed, which seemed to work for some but not for others, depending on exactly how their network interfaces were managed, and what specific services they were using...
Bug 712504 - autofs is started before ypbind in Fedora 15 https://bugzilla.redhat.com/show_bug.cgi?id=712504
Bug 709637 - systemd sometimes starts autofs before NIS https://bugzilla.redhat.com/show_bug.cgi?id=709637
This problem will hopefully work itself out as remaining legacy init.d scripts are converted over to systemd. In the meantime, the proposed solution (for bug 712504) _seems_ to be working for me.