Skype – How to Open Secondary Skype in Version 8.0+

You could try editing your hosts file and pointing the offending ad's hostname to 127.0.0.1.

Edit the file %systemroot%\system32\drivers\etc\hosts

To the bottom of the file add the entry:

127.0.0.1 hostname-of-the-ad

Where hostname is the hostname of the ad. For example, if the ad's URL is http://www.some-ad-service.com/, you would use www.some-ad-service.com as the hostname (thanks slhck, for pointing this out).

Save the file.

Now whenever your machine attempts to access the ad's URL the request will be sent to your local machine instead. The end result being that the ad is blocked.

Microsoft Notification Protocol

"Microsoft Notification Protocol (MSNP, also known as the Mobile Status Notification Protocol) is an instant messaging protocol developed by Microsoft for use by the Microsoft Messenger service and the instant messaging clients that connect to it, such as Skype since 2014, and the earlier Windows Live Messenger, MSN Messenger, Windows Messenger, and Microsoft Messenger for Mac. Third-party clients such as Pidgin and Trillian can also communicate using the protocol. MSNP was first used in a publicly available product with the first release of MSN Messenger in 1999." (https://en.wikipedia.org/wiki/Microsoft_Notification_Protocol)

This command resets this protocol. I am not sure why you had to relogin. I would assume restarting skype would have the same effect.