Hi,
I remember this problem, but I cant recall how I fixed it. I think it had something to do with resolving the machine name/IP address.
At any rate, you should check out your IIS logs and your Event log. They may help.
Cognos KnowledgeBase article 113725 looks firmilar -
If your web server is configured to use fully qualified domain names, then the Upfront Gateway url in Configuration Manager must use the fully qualified domain name syntax (servername.domain.com).
Steps:
1. Launch Configuration Manager from the command line. ($.../cer2/bin/configure)
cd server name
cd "Cognos Shared"
cd "Runtime Parameters"
cd "Server Configuration"
cd upfront
cd "Upfront Server Group"
2. Change the gateway to a fully qualified domain name using the set command (do not use quotes around the URL) -
set gateway =
3. Apply the changes and start the machinename.