Renew user certificate

Three years after creating your DFN Global user certificate, you will receive an automatically generated email "Your certificate will expire". If you want to renew your certificate, please follow the instructions in steps 1 (request) and 2 (retrieve & secure) of user certificates.

To renew the DFN Global certificate, it must be regenerated and you must identify yourself again. Please make sure that the DN (i.e. your name) of the new certificate matches that of the old one (exceptions: marriage, etc.).

Communication and Information Centre (kiz)

Please contact us if you have questions or problems related to the kiz services:

Office hours
Monday - Thursday
09:00 h - 12:00 h and 13:00 h - 15:30 h

Friday 09:00 h - 12:00 h

+49 (0) 731 / 50 - 30000

+49 (0) 731 / 50 - 1230000

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Support Portal (Uni internal)

Service Points are locations where you can visit us personally.


Using self-service functions of the Identity Management System (IDM): Administer permissions, subscribe to services, change passwords.

IDM Self Services

Research in the library stock: monographs, textbooks, magazines, university publications, e-books, e-journals, national licenses, and the contents of the institutional repository OPARU.

library catalogue::local

With about 400 keywords you will get direct access to our services. If something isn't listed, please contact our Internet Editorial Office.

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more about: DFN Global certificates

In order to issue a user certificate, your identity must be verified by personally appearing at our registration office at the following service point:

kiz University West
Central Library
Service Point Information
Tel: +49 (0) 731 / 50 - 15544
E-Mail: ra(at)
Registration by telephone or e-mail is requested. For opening hours, please refer to the linked website of the Service Point.

To apply for a server certificate, please contact us using the email address above.