Yahoo Mail Login is blocked - have to forcefully accept and proceed

@ 30/7/17, 7:40 PM : Every now and then (but NOT always), Yahoo Login website is blocked by Norton ; I then have to forcefully accept the site and proceed - Yahoo website :

https://us.mg1.mail.yahoo.com/neo/launch#675053130 {The Last No could change from time to time.}

I even tried changing https to http, but it (obviously) does NOT solve the problem.

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Upon searching, I found that M/s Gayathri Rajendiran has replied on 30th Apr, 2013 in :

https://community.norton.com/en/forums/yahoo-mail-blocked-labelled-red-x :

“This issue has currently been resolved ??. Can you please check again & let me know if the problem still persists?”

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BUT the Issue persists !!!  Pl resolve.

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Also, pl let me know the procedure by which we can ADD such TRUEly Safe Websites to a Norton Safe List ?? (all such Steps within Norton Security pl ; I don’t want to buy additional S/Ws over S/Ws over S/Ws pl.).

BTW, I have been using Norton for the past > 7-8 yrs.

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BTW, I have already read through these Norton sites :

1) https://support.norton.com/sp/en/us/home/current/solutions/kb20090410134005EN_EndUserProfile_en_us?abproduct=home&abversion=1&entsrc=redirect_pubweb&pvid=f-home

{But, this (Yahoo Mail webpage) is not any New Website of my own !}

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2) https://dns.norton.com/

{As I wrote, I don’t want to install any more Additional S/Ws over and above N Sec.}

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However, if installing any Additional Norton Product is a MUST, pl let me know the Step-by-Step Procedure.

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Rgds

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