Using -inetd option with tigervnc caused tigervnc to immediately crash.
Tigervnc immediately crashes and is not usable.
I didn't backport IPv6 support properly during tigervnc rebase for RHEL 7.2 and there was a missing part of IPv6 patch which was causing this crash. The missing part was added and tigervnc no longer crashes with -inetd option.
You can now use tigervnc with -inetd option.