I have the same issue happening to me. I have a Small Office Edition for my lab. I had it happen on my last computer. I could connect to other IPOffices, but not to my SOE. My laptop could connect to it without any problem. I got a new computer, and everything worked fine. Then today, it started happening again with my new computer. I changed Nothing. I have tried unistalling, reinstalling, I even cleaned up the Registry files, still, I cannot connect. I can access the security settings, and even upgrade.
Has anyone figured this out yet???