Since a few days the launcher throws a "password or username wrong" error, when I try to log in with my VPN enabled. When turned off, the login with the launcher works like usual.

The correct message would be: "Your source IP is blocked."

This also applies to the Mojang website with one exception: The password reset function DOES WORK. When you reset the password with VPN enabled, this throws success, but when you try to log in on the website, it says "password or username wrong", like the Minecraft launcher also does.

So, besides the buggy message, I'd like to address this issue, as I cannot play without VPN applied since I have a centralised router.
So, the launcher needs to accept Leaseweb orginated connections again. Leaseweb is a normal hosting company as many are. There is no reason to lock out the whole range of that hoster.

If needed, I can also supply the network range for my required Leaseweb connection.

In the case the IP range ban cannot be removed, I need the IP that the launcher connects to, to work around the VPN using a VPN-free network route to that IP.

Thanks in advance for adressing these issues! : )
Kind regards,
His_Cifnes