Have this interesting situation. Three Windows 2003 servers behind a firewall with private 192.168.x.y IP numbers consistently get the eventid 16 mentioned, and fail to update automatically. Manual connections work fine with no problems or issues, indicating the network, firewall and proxy settings are all OK. I've followed several suggestions from different newsgroups and Technet, none of the suggestions have solved the issue. There is no WSUS server in our site, and all servers go to the microsoft update site. All servers in the domain with public IP numbers update with no problems. These three fail, the common link being private addresses. Any suggestions, pointers to resolution, thoughts appreciated Bill

Hi Bill, A great first place to look would be c:\Windows\WindowsUpdate.log - Liam