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when i want to login on this site http://estudent.uni-lj.si/, it says that my digital certificate is expired and that certificate is not valid for any server.

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My digital certificate is valid till 2015 and the problem only occures on my PC. my account on the site works on other computers, even ones without the certificate. Here I try to click Log in, but it wont get me anywhere, it just says that certificate is expired and that certificate is not valid for any server and all that I can click is Try again.

My digital certificate is valid till 2015 and the problem only occures on my PC. my account on the site works on other computers, even ones without the certificate. Here I try to click Log in, but it wont get me anywhere, it just says that certificate is expired and that certificate is not valid for any server and all that I can click is Try again.

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Is the date / time set correctly on that PC?