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 - MSSQL Query Wizard - Invalid characters in the username
Viewed 1283 times since Thu, Aug 3, 2017
Nagios XI - Warning: Duplicate definition found for contact ’xi_default_contact’
Viewed 1231 times since Tue, Jan 26, 2016
Nagios XI - WMI Authentication Problems
Viewed 2187 times since Thu, Feb 25, 2016
Backups are not being generated due to tar creation errors
Viewed 158 times since Thu, Feb 27, 2020
Nagios XI - SQL Error [nagiosxi] : ERROR: syntax error
Viewed 1411 times since Sun, Sep 10, 2017
Nagios XI - Windows Memory Usage - Physical
Viewed 5084 times since Tue, Jan 26, 2016
Nagios XI - mysql_error out of range value for column
Viewed 1315 times since Tue, Aug 14, 2018
PHPMailer - Troubleshooting Using Debug Logging
Viewed 2292 times since Tue, Aug 14, 2018
Pages Not Displaying Correctly
Viewed 1561 times since Mon, Jan 25, 2016
Nagios XI - Last Check Time Not Updating
Viewed 5225 times since Tue, Jan 6, 2015