try to solve the problem of checking if an address is on your white list in Proxmox. If Proxmox runs on a Linux-based system, so you can leverage command-line tools like grep to search for an address within the white list file. Open a terminal on your Proxmox server and use a command like the following to search for an address in the white list file:
grep "address_to_search" /path/to/white_list_file
Or some problems like this can be solved with help of
tech support company etc. Maybe you should consider using their services