Jeff Sanders Technical Blog

I am a Microsoft employee that has worked on all aspects of the Web Stack for a long time. I hope these blogs are useful to you! Use this information at your own risk.

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Workaround For Wininet Dns Not Refreshing When Using Kb 263558

- 14 Nov 2008

If you are making Synchronous calls in WinInet, the DNS timeouts don’t appear to work when set (see: http://support.microsoft.com/kb/263558 ).

Async calls do however work correctly.

One workaround is to simply restart the application using WinInet. 

I found a code workaround for the issue as well.  Simply open and close the handle you get with the InternetOpen call then open it again:

hOpen= ::InternetOpen(…..);

InternetCloseHandle(hOpen);

hOpen= ::InternetOpen(…..);

// now use handle…

 The performance impact will be very low.

 -Jeff

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