Is the M2950 connected to your laptop via the console port?
Do you have the sensor connected to the network via it's management port?
If you run the 'show' command on the sensor is it displaying the correct network settings?
Did you use the the wizard to set up the sensor or set it up manually?
Thanks for your response.
I have just figured it out in the last 10 minutes.
When i went through the setup process, i left the default ip 192.168.100.100 for the sensor in place as i saw no reason to change it for testing purposes.
Apparently, the sensor does not like this one bit!!!
As soon as i changed it to a 192.168.0.240 it established the trust within about 30 seconds!!!
One to bare in mind for the future