The www/otrs port is two versions behind upstream. Just changing PORTVERSION= 3.3.7 -> 3.3.9 in the ports Makefile works fine for me, but I am not yet sure how to generate and verify package plist, so I would like to ask ports maintainer for update.
Maintainer CC'd
Added link to small improvement proposal - automatic setting of the required permissions, which may be carried as part of the upgrade.
If you have time, please have a look at the Porter's Handbook. You should find all the required information to send us a patch.
Please see bug 196042 which contains a patch to update. And I guess this one can be safely closed now.
See 196042.