Hello everyone!
Since I made changes to my hosting server, I have received error messages in the system log.
This message is as follows:

A redirection to an external URL https://cybercity.internetstate.eu.org/ was blocked for security reasons.

My server is configured as having (internetstate.eu.org) as the main domain, so each site that I will host will have a subdomain (example.internetstate.eu.org), even if it has a top domain configured. My site that has received this error message in the system log, has the following domain (cybercity.eu.org) which is an add-on domain that uses the subdomain (cybercity.internetstate.eu.org). However, b2evolution has started to block for security reasons.
I would like to know, how to solve this problem and make b2evolution understand that the subdomain is safe. Although I added the domain in question as safe in "Referring domains", the problem still persists, which makes me believe that there is still something to be done.

So I come here and ask for help to solve this problem, because that way it cannot stay. Thanks!

PS: I would also like to know if these warnings have to do with the antispam plugin.