Why the website is requiring my computer to send a client certificate

I can no longer access my course's website using Safari. A message pops-up informing that the site is requiring a "client certificate to validate my ID"  to get through the main page. When I click on the available certificates that Safari offers me, the same message pops-up again, and I can't go foward. When I access the same website using Chrome from a Vaio computer, this problem does not occur. What should I do? I never had this problem before.
Thanks for your help.
Renata

Hello Peter249,
>> but I don't have that option on the server and must supply it via code (C# .NET 4.0).
From your description, it seems that you are trying to create a SSL communication between your server side and client side. As far as I know, we need to install the certificate file in both client side and server side and if you are using server mode, for
creating the SSL communication, we must import a certificate with the associated private key to the server machine's Personal store. For details, please check this link:
SSLStream example - how do I get certificates that work?
By the way, since you are working with a web project, it is recommended to post asp.net related issues to:
http://www.asp.net/
Regards.
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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