Certificate error connecting to VPN, can not validate server

Used the configuration utility to configure a profile for VPN using certificate as authentication. Keep getting error, can not validate server. When I export the cert to my desktop, I see the CRL information in it. When I view the details of the cert after installing on the iPad, I don't see any CRL information. I'm guessing this may be the problem only not sure how to resolve it.

solved the problem by adding an additional attribute in the certificate request to the VPN server (cisco router) and first enable the server SubjectAltName CA
In CA server:
certutil -setreg policy\EditFlags +EDITF_ATTRIBUTESUBJECTALTNAME2
certutil -setreg policy\SubjectAltName enabled
certutil -setreg policy\SubjectAltName2 enabled
net stop certsvc
net start certsvc
In certificate request for VPN server:
In the Attributes box, type the desired SAN attributes. SAN attributes take the following form:
san:dns=dns.name[&dns=dns.name]/san:ipaddress=x.x.x.x
(external dns/ip)
http://support.microsoft.com/kb/931351

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