Lotus Connections communities and Java policy files
Brain dump...
Only technote I could find that mentioned tango.policy was technote 1286604 but that wasn't it. I did however find a clue in the Lotus Connections wiki and was able to adapt it to my needs.
<Application server (e.g. server1)>\Java and Process Management\Process Definition\Java Virtual Machine\Custom Properties java.security.auth.policy -> <path to communities.policy file>



