Error message: Failed to connect to backup server: Server Veeam Backup Server Certificate certifikate is not trusted

Did you get a message when running the console to accept the SSL?  Once you do that it should work.

Close the console and try again.

I received the message and accepted it, but it's still giving me the same error.

As I shared in the other thread you posted on; I’ll add the same here:

“There are a couple relevant areas in the Uesr guide discussing certificates ​@Marko_NS . Have you looked at them?

https://helpcenter.veeam.com/docs/vbr/userguide/trusted_root_certificates.html?ver=13

https://helpcenter.veeam.com/docs/vbr/em/hmc_manage_certificates.html?ver=13

Also, where specifically are you getting the error? In VBR? VeeamONE? VBR Console when trying to log into VBR? At the very least, it’s always best to open a Support case as this forum is not Support. Provide more info and we can try and assist; but again..Support is ultimately the way to go.”

Best.

Then it should be good if accepted.  Unsure why it would still throw the message and opening a support case would be a good next step as Shane noted.

I have imported all these certificates and it's still giving me the same error.

I can't use WEB UI because I have comunity edition

Since you have community edition the only other suggestion would be to do a clean removal and reinstallation to see if that fixes it?  Otherwise you will need to open a ticket even being on CE.

Not really have any other suggestions than what’s provided. 

One option to log into the WebUI would be to reach out to a local Veeam SE and attain a Veeam NFR license.