Today is slow on new topics so I thought I would share a nice (D)IIOP notes.ini related setting for the Domino server. When you run the Domino IIOP server behind a NAT'ed connection you will need to change the IP address that the server publishes through its diiop_ior.txt file. If you don't clients will try to connect to the un-NAT'ed IP address instead of the NAT'ed one (since that's the one Domino binds to).
The solution is to set the DIIOP_IOR_HOST notes.ini setting to the NAT'ed address and restart the DIIOP task. This will make the diiop_ior.txt contain the NAT'ed address.
Please note that the setting is called DIIOPIORHOST from Domino 7 and onwards but DIIOP_IOR_HOST is still supported as stated in the notes.ini documentation on developerWorks.