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ASDM Issue

I am working with a Cisco ASA5540 firewall, and had the ASDM up working okay.  It suddenly stopped working, and now just displays a "Page Not Found 404 Error", when trying to load it up via  Does anybody have an idea of what may have happened?

 

I have tried running it from the DOS command line, and get a "Unable to launch the application."

 

I ran the following command on the firewall:

 

ciscoasa5540# show run asdm
asdm history enable
ciscoasa5540#

 

This might be a certificate related issue, as I recently installed SSH connectivity on the firewall.

 

Unfortunately, I am unable to remove the SSH configuration.  I get this:

 

ciscoasa5540(config)# ssh disconnect ?

exec mode commands/options:
<0-2147483647> SSH session id to be disconnected

 

I do not know what the SSH session id is.  Please help.  I really need the ASDM to be up and running again.  Thank you!