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(Last Updated On: October 28, 2014)

When you reach a screen indicating a problem with a Security Certificate don’t panic.

These errors indicate that the common name (domain name) in the SSL certificate (authenticated in your browser) doesn’t match the address that is in the address bar of the browser.  For example, if the certificate is for and you access the site with a link such as  you will get this SSL certificate name error.

(The  ‘0-‘  and ‘’ added to a URL direct authentication to the proxy server on OASys, Oxy’s library system, so that the remote server recognizes you as being affiliated with Occidental College.)

This is referred to as a Third Party certificate and it confuses your browser unless you add it in as an exception. Exceptions may not be remembered by your browser when you update to a newer version. The following examples will guide you through the process of adding a security exception.

Internet Explorer:

I.E. has scary message but please don’t be frightened. Any third party certificate will show up in the address bar of I.E. and will contain or in it as in this illustration.  You can trust these sites.



To add this exception in Internet Explorer, click


Continue to this website (not recommended)

And follow the prompts to add this exception.  As long as a site has in it there is no danger.


In Google’s Chrome browser the warning message will explicitly include the in its wording.  Don’t be concerned – your privacy will be maintained by adding the exception. OASys will encrypt tour personal information so others will not be able to view it.




(Proceed to … and follow the prompts to add the exception.


Firefox has the least scary warning for a security warning. will be in the address bar and you see this message:


Click  “I understand the Risks”  and then “Add Exception” to you will see this screen:


Click “Confirm Security Exception” and you will proceed to the site in question.

To recap … 

Security Warnings may seem ominous but if  is included in the URL string you are protected by OASys, Occidental College’s automated library system.