Even with the latest version of the Cisco VPN client (currently 5.0.03.5360) the error 27848 relates to the deterministic network enhancer requiring a reboot first to free up locked resources and to run the install after rebooting.

This lame error is easily fixed by unregistering an old DLL

start -> run
regsvr32 /u dneinobj.dll

Rerun the install

After getting the console cable out of the PIX you could well be a little annoyed when you can't SSH in even with the right access-lists. One thing you'll notice is you get dropped out of SSH with:
ssh_exchange_identifcation: Connection closed by remote host

Double check you have the right IP's allowing you to connect:

pix(config)# sh run | grep ssh
ssh 195.195.195.195 255.255.255.255 outside
ssh 192.168.123.0 255.255.255.0 inside

But then most importantly do the following to generate and save your key

ca generate rsa key 1024

If you want to use your Cisco 7940 & 7960 with asterisk you firstly need to unlock the phone.

To do this enter:

**# (for older firmware) or by selecting unlock config from the config menu

The default password is "cisco"

Once in you can then enable DHCP and specify an alternate TFTP server to have your SIP firmware images sent to the phone