On IIS 6 you can disable CRL check by running following command    
 
C:\Inetpub\Adminscript\cscript.exe adsutil.vbs Set W3SVC\CertCheckMode 1 but on IIS 7 we don't have metabase.xml. Now this key has been moved to Registry 

 

http://www.asprangers.com/post/2012/04/02/How-to-Disable-CRL-check-on-IIS-7X.aspx

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