Situation: We upgraded our Netscaler VPX from 10.0.70.7 to 10.0.76.7 and we were then unable to authenticate to the netscaler console using our LDAP credentials and users were unable to authenticate at the Access Gateway pages.

Solution: During the VPX upgrade the Netscaler truncated the first 2 characters of each line of the Authentication server section (including the password)

Either manually restore the information or copy the authentication lines from a backup of the previous ns.conf