rds feed certificate problem

hello,

i setup rds and every tings work fine from a computer browser...

when i try to add the rds web fee it's give me this error:

The remote computer cannot be authenticated due to problems with its security certificate.


Security certificate problems might indicate an attempt to fool you or intercept any data you send to the remote computer.

so where is the problem? the link is : https://servername.domain.local/rdweb/feed/webfeed.aspx

thanks.