https://help.yahoo.com/help/us/mesg
https://search2.cc.scd.yahoo.com/cct...55#__highlight
Go to these pages and search your error.. note that yahoo help have a form to contact with your pc and see the problem, you can get this service by following the second link.
my note: check the fire wall or proxy used in server
sorry, I have a problem with arabic typing in my browser
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