Restricting access to a virtual server by Public IP address should access through only domain name.

Hello,

please note first, that version 11.5.8 is out of any supprt and service from April 8, 2019 as you can see in BIG-IP software support policy (f5.com)

For your problem, solution via iRule is a viable. also you could utilize LTM Policies.
But as you describe you can't add the iRule (which is based on HTTP Events) because you do not have any HTTP Profile on Virtual Server.
This Profile is required to validate or manipulate data on HTTP Layer.

And as you described you also have application issues if you apply an HTTP Profile it seems that the Application is protected by SSL / TLS. In this case you would also need an Client SSL / Server SSL profile

So the F5 will be able to decrypt and encrypt the connection and after that apply the http profile to make your iRule work.

But most important: Get an updated F5. This software Version is old and has maaaaaany Security and operating flaws

Regards

Hi vishu_chavan , 

Could you please send the irule script that you use now. 

> it's mandatory to assign http profile for this irule. 
> although you have a non supported version and you need to upgrade , but try the below irule script : 

when HTTP_REQUEST {
	    if { ([HTTP::host] != "www.example.com") } {
	       reject
	    }
	}

> Replace "www.example.com" by your correct FQDN. 
and let me know the results 

you can try below irule as well 

replace x.x.x.x with your ip address

when HTTP_REQUEST {
If { !([HTTP::host] equals "x.x.x.x") } {
Reject
}
}