error message "there was a problem connecting to pop.mail.yahoo.com".

This is a repost of my original. I've seen a couple of moderators posts saying they are anxious to help and would like to know the specific issue. I can't state it any more simply than this. I kind of think the moderators are incentified in some way for posting the offer to help without actually providing any, please prove me wrong and help me.

I'm trying to add my new Yahoo email account to my Gmail email account a of nd I keep getting this error: "there was a problem connecting to pop.mail.yahoo.com". I've checked my cox email address and my Yahoo password and scanned a number of online documents but I cannot find a solution. Any help would be appreciated

I did complete the transition from COX to Yahoo, I generated a new password, my emails were transferred, I've logged in and out of my Yahoo account several times. I enter the correct information in gmails set up screens (several times) and continue to get this message. In the set up screens I enter my complete cox email address, my yahoo password, and pop.mail.yahoo.com.