Unable to connect to Yahoo POP account

Unable to connect to Yahoo POP account

Hello, I am unable to connect to my Yahoo POP account using both pop.mail.yahoo.com and pop.mail.yahoo.it POP servers with port 995 and SSL.
First I get this message:
Invalid Security Certificate for the Server. Please change the incoming port to 110 and retry configuring.
and when I change to port 110 I get this other message
Problem in the connection with the mail server

Can somebody help?

Thanks