Hello and Welcome to FixYa!
If you are having trouble signing in to Yahoo Messenger and you are sure you correctly typed the password then click the "troubleshoot" button on the dialog box that says unable to sign in. It will automatically check your connectivity to internet, ports and other security issue that may be forbidding it to sign in. Clicking the troubleshoot button will automatically solve the problem.
If you have any further queries, please do not hesitate to comment again.
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Regards,
Waqar.
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