Hi folks, if you are still having this issue I have resolved it this morning. Back when we shifted to User based filtering, RM provided us with a proxy which circumnavigates a lot of the userproxy restrictions, we use it on some of our servers.
This morning I chucked that proxy server address and port into the section of SIMS installed on my PC from the tab Tools > Setup > SIMS Services > Default Proxy Settings > 'Use the following proxy server' and in our case, we use proxy2.rmsafetynet.com:8080 and this will allow all SIMS services like DMS to tunnel through, and as long as you had the correct permissions, once saved, this will change this setting across all workstations on your Domain.
Hope this helps, as trust me, I have been banging away at this issue since Thursday last week with almost zero help from SIMS.
