Hi! i need to change the IP adres on an Windows based vCenter server. Allthough this is not supported what issues can i come across?
It's not true. You can change VC IP and it shouldn't cause serious issues.
Maybe this one VMware vCenter Server IP address change causes VMware ESX hosts to disconnect (1001493) | VMware KB or possibly you will need modify accordingly your external solutions if they are configured using VC IP instead of FQDN.
Changing the vCenter server IP leads to ESXi hosts disconnection from the vCenter as the hosts store the IP address of the vCenter server in configuration files of each of the individual servers. This incorrect address continues to be used for heartbeat packets to vCenter Server and hosts get disconnected. Changing the vCenter IP address also affects any other VMware/third party components registered with vCenter using the IP address.
In case, if you still want to change the vCenter IP address, you can change it using the below steps. Ensure to perform this activity in a maintenance window as it will impact your complete environment.
1. Change the DNS to reflect the new IP address
2. Change the 'Managed IP address' in vCenter advanced settings .For more information see Verifying the VMware vCenter Server Managed IP Address (1008030)
3. ESXi hosts must be made aware of this change as they will continue to heartbeat to the old vCenter IP address .Follow the steps in vCenter Server IP address change causes ESX hosts to disconnect (1001493)
4. Re-register SSO & Inventory Service to vCenter Server by following the steps in Re-pointing and re-registering VMware vCenter Server 5.1 / 5.5 and components (2033620)