Internet Explorer Blocked this website Certificate Error

[round2it]

Hi All

 

Can anyone shed some light on what might be causing this issue.

 

Some websites youtube for example display Internet explorer blocked this website from displaying content with security certificate errors

 

I am using IE9 (dont ask)

 

cant pin it down to whats going on

 

Do i need to push out an update for root certs via wsus if so whats the KB

 

not displaying the error in the odd xp clients we have on IE8

 

 

The time on server and clients is correct and synced.

 

It must be something to do with the Zones but not sure what option to change Any help would be appretiated.

 

tried installing the certificate from the site but makes no difference

[free780]

Do you do ssl interception? And/or using a proxy?

[round2it]

yes we use a proxy provided by the YHGFL

 

next test i was going to do was use my phone to connect to the internet bypassing the YHGFL connection to see if the errors come back

[round2it]

Ok

 

Using my phones internet connection i do not get certificate errors so the proxy is the issue.

[free780]

Check the expiration on the SSL cert.

[round2it]

looks like a problem with the smoothwall used by the yhgfl.