vCenter Server and Microsoft Internet Information Service (IIS) both use port 80 as the default port for direct HTTP connections. This conflict can cause vCenter Server to fail to restart after the installation of vSphere Authentication Proxy.
vCenter Server fails to restart after the installation of vSphere Authentication Proxy is complete.
If you do not have IIS installed when you install vSphere Authentication Proxy, the installer prompts you to install IIS. Because IIS uses port 80, which is the default port for vCenter Server direct HTTP connections, vCenter Server fails to restart after the installation of vSphere Authentication Proxy is complete. See Required Ports for vCenter Server.
- To resolve a conflict between IIS and vCenter Server for port 80, take one of the following actions.
If you installed IIS before installing vCenter Server
Change the port for vCenter Server direct HTTP connections from 80 to another value.
If you installed vCenter Server before installing IIS
Before restarting vCenter Server, change the binding port of the IIS default Web site from 80 to another value.