Certificate errors on all browsers when trying to access secure sites

We have just setup a new TMG forefront server and since I presume some change was made, we are all getting the following message when trying to access legit secure sites such as the bank sites.

"To help protect your security, Internet explorer has blocked this website from displaying the content with security certificate errors. Click here for options."

You can show blocked content but is is TMG that is causing this issue?
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Jamesm007Asked:
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Jamesm007Connect With a Mentor Author Commented:
I just worked it out, It seems that after turning off allow HTTP inspection ins forefront this has resolved the issue!

I dont recall turning it on
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rockiroadsCommented:
I assume this is IE? did u try changing the security settings?

first give this a try

tools->internet options->security tab->internet->custom level_>find display mixed content and set to enable

or if running on trusted sites

tools->internet options->security tab->trusted-> click on sites then add your websites
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rockiroadsCommented:
im not too familiar with forefront but is there a security wizard?

I was reading this and it talks about https inspection. is this something you have dealt with? http://www.microsoftnow.com/2010/06/blocking-skype-and-other-im-protocols-in-forefront-tmg.html
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rockiroadsCommented:
oh, beaten me to it :) I was searching the net trying to find solutions to your problem. Well hopefully the link given gives you some insight to https inspection. I think it needs the web access policy configuring to make it more secure.
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Jamesm007Author Commented:
yes thanks, I think someone internally has been playing with my servers and has changed something as it was working yesterday and problem occured this morning :(
Too many techs, no one willing to own up!
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