posted this on the Fedora/RedHat Bugzilla at id 1665536 firewalld is off but just today NIS logins stopped working. yppasswd is erroring out with: ourdomain: RPC: Program not registered yppasswd: rpcb_getaddr (ourdomain) failed! 4.19.13-300.fc29.x86_64 nfs-utils-2.3.3-0.fc29.x86_64 ypserv-4.0-12.20170331git5bfba76.fc29.x86_64 ypserv debug has: Jan 11 11:43:05 ourdomain ypserv[21961]: #011ypdb_open("ourdomain", "hosts.byname") Jan 11 11:43:05 ourdomain ypserv[21961]: Found: ourdomain/hosts.byname (8) Jan 11 11:43:05 ourdomain ypserv[21961]: ypdb_close() called Jan 11 11:43:05 ourdomain ypserv[21961]: #011-> Error #-3 I've reported this error in the past in BZ 1478129 and BZ 1488616. Just in case it appears nfs-utils upgraded over night and I manually downgrade but same errors: 2019-01-11T14:47:30Z DDEBUG Command: dnf install -y nfs-utils 2019-01-11T14:47:30Z DDEBUG Installroot: / 2019-01-11T14:47:30Z DDEBUG Releasever: 29 2019-01-11T14:47:30Z DEBUG cachedir: /var/cache/dnf 2019-01-11T14:47:30Z DDEBUG Base command: install 2019-01-11T14:47:30Z DDEBUG Extra commands: ['install', '-y', 'nfs-utils'] Some proof that this was the results of an update to NFS. file /etc/systemd/system/nfs-*.service.requires/nfs* /etc/systemd/system/nfs-blkmap.service.requires/nfs-convert.service: broken symbolic link to /usr/lib/systemd/system/nfs-convert.service /etc/systemd/system/nfs-idmapd.service.requires/nfs-convert.service: broken symbolic link to /usr/lib/systemd/system/nfs-convert.service /etc/systemd/system/nfs-mountd.service.requires/nfs-convert.service: broken symbolic link to /usr/lib/systemd/system/nfs-convert.service /etc/systemd/system/nfs-server.service.requires/nfs-convert.service: broken symbolic link to /usr/lib/systemd/system/nfs-convert.service file /etc/systemd/system/rpc-*.service.requires/nfs* /etc/systemd/system/rpc-gssd.service.requires/nfs-convert.service: broken symbolic link to /usr/lib/systemd/system/nfs-convert.service /etc/systemd/system/rpc-statd-notify.service.requires/nfs-convert.service: broken symbolic link to /usr/lib/systemd/system/nfs-convert.service /etc/systemd/system/rpc-statd.service.requires/nfs-convert.service: broken symbolic link to /usr/lib/systemd/system/nfs-convert.service So the update that creates a new /etc/nfs.conf file appears to be related. I enabled UDP and this happens: systemctl restart nfs-server Failed to restart nfs-server.service: Unit nfs-convert.service not found. Now see the broken pipe: dnf reinstall nfs* Last metadata expiration check: 0:06:50 ago on Sat 12 Jan 2019 08:29:40 PM EST. Dependencies resolved. Package Arch Version Repository Size Reinstalling: nfs-utils x86_64 1:2.3.3-1.rc2.fc29 updates 357 k Transaction Summary Total download size: 357 k Installed size: 1.3 M Is this ok [y/N]: y Downloading Packages: nfs-utils-2.3.3-1.rc2.fc29.x86_64.rpm 209 kB/s | 357 kB 00:01 Total 112 kB/s | 357 kB 00:03 Running transaction check Transaction check succeeded. Running transaction test Transaction test succeeded. Running transaction Preparing : 1/1 Running scriptlet: nfs-utils-1:2.3.3-1.rc2.fc29.x86_64 1/1 Running scriptlet: nfs-utils-1:2.3.3-1.rc2.fc29.x86_64 1/2 cut: write error: Broken pipe cut: write error: Broken pipe rpm -q nfs-utils nfs-utils-2.3.3-1.rc2.fc29.x86_64 rpm -V nfs-utils SM5....T. c /etc/nfs.conf S.5....T. c /etc/sysconfig/nfs S.5....T. c /var/lib/nfs/etab .....UG.. g /var/lib/nfs/statd/state I upgraded nfs-utils to nfs-utils-2.3.3-3.rc2.fc30.x86_64 enabled debug setting to "all" in /etc/nfs.conf seeing this: rpc.nfsd: knfsd is currently down And the nfs service has disappeared: systemctl status nfs Unit nfs.service could not be found.