So maybe you have a slow people picker? We did. The network guy said “Let’s check which ports are being blocked.” I thought “well, it’s working so I don’t know what good that’s going to do? It’s just super slow.” but I bit my tongue and went through the motions.
We saw that port 3268 was being blocked from SharePoint servers to AD. We unblocked it and the people picker ran like the wind. I was amazed. Now that we new the port number things became easier to find. First thing I did was tweet about it. Then we went and did some research.
Our infrastructure was a little weird, they are . . . let’s say, firewall friendly. Between the 3 servers in the SharePoint farm there are 3 firewalls and then between all that and AD there’s one going out and one before active directory. The outbound firewall ...