Hi Preet_pk​ ,

Have you try this article:

K03531511: BIG-IP Unreachable through HTTPS

https://my.f5.com/manage/s/article/K03531511

Environment

• BIG-IP unreachable on GUI
• SSH working fine

Cause

The tomcat, httpd, restjavad or restnoded processes might become unresponsive and stop working. (Usually tomcat or httpd).

Recommended Actions

Restart the aforementioned processes with this command:

bigstart restart restjavad restnoded httpd tomcat

Note: this is not traffic-impacting.


Also you can Check in bash mode if any memory or cpu issue , check the processes

top
or

htop

Also check the following logs for any errors an share your inputs

tail -f /var/log/httpd/httpd_errors

grep -i "error" /var/log/httpd/httpd_errors

cat /etc/httpd/conf/httpd.conf | grep -i "ajp"