skip certificate

i am user WAC server to manage all forest in my Org
using secure winrm on port 5896 only
on my forest the is no problem
but when i try access externl forest i get "The SSL certificate could not be checked for revocation."
i guess the it because i cant access the CRL location
when i try access with power Shell form the WAC server using "New-PSSessionOption -SkipCACheck -SkipCNCheck -SkipRevocationCheck"
i am able to connect the server on 5896

is there a way the when using the WAC on External Domains we can SkipRevocationCheck
Roni