A security incident recently occurred involving VOSviewer,a software tool developed by CWTS and used by researchers worldwide. The incident was detect...

There is a glitch causing visitors to unintentionally see a CAPTCHA in some cases. We are investigating this as a priority. We apologize for the incon...

Leiden University is moving to a more uniform sign-in experience. As a result, the familiar blue ULCN sign-in page will gradually be replaced by the M...

This morning there was a brief disruption affecting the new login page; all issues have now been resolved. For more information, see: https://www.staf...

At the moment, there is an outage affecting eduroam across Leiden University. This means you are currently unable to log in via Wi‑Fi. We are analy...

There is currently an issue with signing in using multi-factor authentication via email. The emails with the verification code are arriving late. In s...

At the moment, we are experiencing an outage, which means our incident registration system is not available.

The USIS website is currently unavailable. We are working on a solution and doing our best to restore the service as quickly as possible.

Due to a technical fault, the Leiden University staff website is currently unavailable.

Since this morning, there have been connection issues with AFAS Online, which may prevent you from logging in or working, or cause the connection to b...