On NetScaler 11.1 Build 54.14 (and Build 54.16), when trying to create new SSL profile (regardless of FrontEnd or BackEnd type) from within GUI, it may fail with the following error message: "Invalid argument [strictsigdigestcheck]"
This known issue has been fixed in the later NetScaler Release 11.1 Build 55.10
As a workaround, create new SSL profile using NetSaler CLI and then continue SSL profile configuration from within GUI.> add ssl profile mySSLprofileBackEnd -ssl3 disabled -sessReuse ENABLED -sessTimeout 120 -sslProfileType BackEnd FrontEnd > add ssl profile mySSLprofileBackEnd -ssl3 disabled -sessReuse ENABLED -sessTimeout 120 -sslProfileType BackEnd Done >
The SSL profile creation using GUI in version NetScaler 11.1 build 54.14 (and Build 54.16) contains the option "Strict Signature Digest Check" which cannot be configured at the time of creating a profile.
This option is not available in the configuration of any other build of NetScaler. When creating the profile using CLI, this option is not used and hence the error is not seen - https://docs.citrix.com/en-us/netscaler/11-1/ssl/ssl-profiles1.html
CTX205291 - What is SSL Profile on NetScaler?
Citrix Documentation: Enhanced SSL Profiles Infrastructure Overview