What is the maximum pre-shared key length?

D-N · ‎04-24-2008

Hello

I am having problems with a remote-access VPN configuration that uses long PSKs. If I use a short PSK, like for instance "cisco", everything is fine but if I use longer stuff (some 20+ chars) I get an error when I try to connect with the VPN client (the error indicates a wrong PSK).

I am worried that using a very short (10 chars?) PSK isn't optimal for security.

amritpatek · ‎05-02-2008

The maximum length of the preshared key should be 128 characters.

You can see the limit here:

http://www.cisco.com/en/US/docs/ios/12_2t/secure/command/reference/sftike.html#wp1065616

D-N · ‎05-02-2008

Thank you very much for the input.

Although apparently, my problems were due to an outdated Cisco VPN Client software. The latest version fixed this issue.

diggy · ‎02-21-2012

Be aware maximum length of VPN3000 concentrators is 32 characters.