I have experienced several recurring issues when accessing AT&T yahoo bellsouth.net email on both my MAC and IOS devices. On my MAC, First error message is "Yahoo! Password Required. Eter your password for "xxxxx" in Internet Accounts" If I choose continue, then I get a message stating "Connection Insecure. Failed to verify the server certificate. This could be because of your network configuration or your proxy settings". Very frustrating... it won't allow me to enter the password. Sometimes if I wait several hours it automatically goes to my email account and everything works?????