Updated xrdp on a Centos 7 system and xrdp would not start. Error logged in /var/log/messages:

Failed at step EXEC spawning /usr/sbin/xrdp: Permission denied

Fix:

chcon -t bin_t /usr/sbin/xrdp /usr/sbin/xrdp-sesman

Reference:

https://bugzilla.redhat.com/show_bug.cgi?id=1177202