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DNS timeout / intermittent website loading problems with cisco routers and Windows DNS servers.

I have had connection issues with RV042, RV082, and now RV180.  I think I finally found the cause to be a feature used on Windows 2008 R2 and newer that provide DNS services.

The symptoms are:  intermittent problems loading web pages, slow loading pages


The cause in our case was a feature of Windows DNS server that potentially conflicts with some firewalls.  This Microsoft knowledgebase article describes the issue and the fix:


Some DNS name queries are unsuccessful after you deploy a Windows-based DNS server


I hope this helps others that have been pulling their hair out looking for a solution.  And hopefully we might see future firmware updates that fix this issue on cisco's routers or provide a way to make adjustments as discussed in this support article.

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