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PDM received an error while sending this command.

Each time I am using the Cisco PDM Version 3.0(4) with PIX Version 6.3(5) I find that I am connected initially, but when i try to apply any commands, I recieve the following error message :

PDM received an error while sending this command. Click Resend and if the browser

prompt you to verify a new certificate or to provide a username/password, please do so.

some of my teammates use command line, some use PDM to config the firewall. I am not sure if it is caused by PDM location, PDM group.

Is there someway to fix the proble? your help is appreciated. Thanks