Home » Categories » Products » Nagios XI » Troubleshooting » Common Problems

Nagios XI - NSP: Sorry Dave, I can’t let you do that


Session protection was added to 2009R1.2C to prevent CSRF attacks. This code to do this caused some users to see this error. The problem was due to the user's browser caching older versions of the XI javascript code. In order to clear the cache and prevent this from happening, you need to clear your browser's cache. This is typically done (in Firefox) by holding down the shift key and clicking reload.


Another possible cause is that the server's time is out of sync with that of the browser. A detailed document that explains all the settings performed can be found here:

Documentation - Changing The System Time


Final Thoughts

For any support related questions please visit the Nagios Support Forums at:


1 (1)
Article Rating (1 Votes)
Rate this article
  • Icon PDFExport to PDF
  • Icon MS-WordExport to MS Word
Attachments Attachments
There are no attachments for this article.
Related Articles RSS Feed
Nagios XI - Empty Screen for Wizard, Component, Dashlet
Viewed 3579 times since Wed, Jan 27, 2016
Nagios XI - Apply Configuration Never Completes
Viewed 16037 times since Tue, Jan 27, 2015
Nagios XI - Bandwidth Graphs Showing 0Mb/s in Non-English Systems
Viewed 3650 times since Fri, Dec 19, 2014
Nagios XI - Modifying The Contents Of /usr/local/nagios/etc
Viewed 2861 times since Tue, Jan 26, 2016
Nagios XI - Downloading A System Profile
Viewed 3225 times since Wed, Jul 19, 2017
Nagios XI - WMI Authentication Problems
Viewed 4995 times since Thu, Feb 25, 2016
Nagios XI - Apply Configuration Fails - Backend login to the Core Configuration failed
Viewed 11204 times since Tue, Aug 2, 2016
Nagios XI - Reset Upgrade Status In Web Interface
Viewed 6060 times since Tue, May 7, 2019
Nagios XI - MRTG Reports SNMP_Session Errors
Viewed 2455 times since Wed, Jul 27, 2016
Nagios XI - Disabling Database UTF8 Connectivity
Viewed 2660 times since Thu, Mar 8, 2018