...
Saves the CustoCfg.ini with the new URL to the disk so that it can be used for future purposes.
Known issues on the sender side:
It may happen that on the sender side, that the channel to evaluation center cannot be established. One of the reasons may also be that the relevant Let's Encrypt CAs are not trusted.
In this case please open one of the system browsers (Edge or IE) on sending custo diagnostic server and go to https://letsencrypt.org/
Afterwards restart the custo diagnostic server on the sending side.