The internet browser you are using cannot automatically install the Root certificate that signed the AUTh Central Certification Authority.

Please download the Root CA that signed the AUTh Central Certification Authority digital certificate from the following links. Then, use the help section of your browser and follow the suggested procedures in order to install this digital certificate in the Trusted Certification Authorities Store.

• The Aristotle University of Thessaloniki PKI Root Certificate in binary form ( DER ).
• The Aristotle University of Thessaloniki PKI Root Certificate in base64 form( PEM ).
• The Aristotle University of Thessaloniki PKI Root Certificate in descriptive form( TXT ).

Kindly check your internet browser's installed certificates section for the presence of a certificate named "Hellenic Academic and Research Institutions RootCA 2006".