I recently had to diagnose a computer that could not connect to a Microsoft Dynamics NAV Environment. The below message was returned;

The client could not establish a connection to the Microsoft Dynamics NAV Server.

Fault Code = ‘InvalidSecurity’

Reason = ‘An error occurred when verifying security for the message.’


After some digging I noticed the time was wrong on the computer. The Windows time service was disabled for some reason.

I set the Windows time service back to Automatic startup and started the service.

A reboot would have probably resolved the issue at this point but I ran “w32tm /resync /nowait” to force a time sync.

Author: Phil Eddies

I am an IT Operations Manager, managing all aspects of the IT infrastructure and service for a mid sized UK based company. I have been working full time in IT since 2001 in 1st to 3rd line and System Administration roles. MCSA, MCSE, CCNA, Citrix CCA