It took me a while to figure out. In gssproxy.service /var/lib/gssproxy/ is set as cache directory but it is not created. Without it the NFS silently fails.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=01409236ba2d705cd50754595f70ee7678ab1224 commit 01409236ba2d705cd50754595f70ee7678ab1224 Author: Matt Turner <mattst88@gentoo.org> AuthorDate: 2019-04-22 20:43:35 +0000 Commit: Matt Turner <mattst88@gentoo.org> CommitDate: 2019-04-22 20:43:35 +0000 net-nds/gssproxy: Create /var/lib/gssproxy/ on install Closes: https://bugs.gentoo.org/603530 Signed-off-by: Matt Turner <mattst88@gentoo.org> net-nds/gssproxy/gssproxy-0.8.2.ebuild | 2 ++ 1 file changed, 2 insertions(+)