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Configuration on Cisco PIX 501

Hi Experts.  I had a client that has DSL as their ISP.  Recently the internet connection failed at the site and in trouble-shooting, the ISP asked the client to by-pass the pix to see if that was the problem.  When that didn't fix the problem, the ISP changed the password associated with the client's account.  Now the pix doesn't have the most recent password.

How do I change the password saved in the PIX for the ISP?  Please offer detailed steps as I am not overall familiar with firewalls.  Thank you!
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Thanks for the post.  So....  how do I get to that prompt?
Access on a PIX is via blue console cable w/ terminal program (such as hyperterm), telnet/SSH, or GUI interface.
10-4

Once I make the connection, I can run the command you gave from anywhere?  I know, dumb question just want to make sure before I get into this firewall.
I have the password to get into the pix but not that username.  I am on-site with the client and we are going through all of the docs.  Where would i find the default username or the username associated with the password?

disregard.  memory lapse.  had to use "enable"
I am at the # prompt.  Now what?  Do I use "write" then the vpdn part you suggested?
You should be able to see the existing vpdn username in the configuration.

Use the existing username with the new password.
how would the command look?  this is what I found:

I tried this first>  vpdn username x password y
but received an error that the user was already created
so I tried > clear vpdn username x
but received an error with store-local.

What would the syntax be to change the password for the user stored in the config?
Never mind.  I believe I found a way.

remove the existing user > no vpdn username user1
then add it back > vpdn username username password password

It appears to be working.  Calling AT&T now to get the pix in place.
If this works, I will close out the question shortly.
I got it to work using the command given in the accepted answer but it wasn't the entire answer.  More was needed.  See my post in 2430885.

Thanks for the help.