Hello,
I'm just a reader of this section but this imminence says 'sounds to me' as an issue related with the firewall section of the router. I've googled and i've found this link, a FAQ Document from Mcafee:
http://service.mcafee.com/FAQDocument.aspx?id=TS100887
The document is not about this problem but has an interesting note:
If i was in your situation, I would take a look of the documentation of your router to see if there is some parameter that limits the number of concurrent connections.Connection issues may be related to the default access rules on your router or the maximum number of connections allowed by the router itself. If the router reaches its maximum number of connections, it may refuse subsequent connection attempts. Router connection issues can appear to be a problem with your McAfee software or other applications; however the solution usually requires you to either reset your router or configure your router to allow more concurrent connections. Consult your router documentation for specific instructions before attempting to configure or reset your router.
Greetings.