Symptom:

AccelSee was installed on the same server (with SharePoint), both AccelSee and SharePoint uses the same port (80).

Solution

1. Open your IIS console
2. Change Default Web Application (AccelSee) to listen on port 81 (or other unused port).
3. Restart Default Web Application
4. Open Registry Editor
5. Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Accelerated Information\AccelSee\UCV
6. Change host.fqdn variable, add ":81". e.g: YOURHOSTNAME:81
7. Open C:\AccelSee\webapps\ClientServices\web.config file
8. Replace all hostname occurance to hostname:81 
9. Done