HTTPs access to NetScaler Console failed after installing a new certificate from GUI System ->Administration ->Install SSL Certificate in NetScaler Console. 

The issue can be solved with the following method after SSH to NetScaler Console. 

> shell
bash-3.2# cd /mpsconfig/ssl
bash-3.2# cp /var/mps/ssl_certs/default_ssl_cert ./cert
bash-3.2# cp /var/mps/ssl_keys/default_ssl_key ./key
bash-3.2# vi ssl_conf  =>Change the content of ssl_conf to the following content. Save it forcedly and reboot the system.
certificate_file: default_ssl_cert
key_file: default_ssl_key

Problem Cause

The https service failed to start because a wrong certificate was installed from GUI System ->Administration ->Install SSL Certificate in NetScaler Console.