Load Balancing IIS Servers

Might be SNI

You can you use either different Server SSL profiles or a generic irule like 

when HTTP_REQUEST
{
    set serverSideSSLSNIName [ string tolower [HTTP::host] ]
}

when SERVERSSL_CLIENTHELLO_SEND
{
	#https://support.f5.com/csp/article/K41600007
	if { [ info exists serverSideSSLSNIName ] }
	{
	    if { [catch { SSL::extensions insert [binary format SSScSa* 0 [expr { [set sni_length [string length $serverSideSSLSNIName]] + 5 }] [expr { $sni_length + 3 }] 0 $sni_length $serverSideSSLSNIName] } ] }
	    {
		    log local0. "ERROR: Attempting to assign server SSL  - SNI : $serverSideSSLSNIName failed"
	    }
	}
}

Thanks for your prompt response.

In this case its a simple plain text virtual server. 

test using "curl -vk http://vip:port/....."
it will show many details to help troubleshoot the problem

if you put irules in the vserver config, also check /var/log/ltm

Hi,

Thanks everyone for your suggestions. We discovered that the IIS Server was trying to resolve the name for the IP address of the source of the connection (the SelfIP of the F5).  On the log of the IIS Servers we found this error No_such_host_is_known 8082 - 10.1.2.193. As soon as we created an entrance on the DNS for the selfIP of the F5, the application started to work.

Does anyone know if this behavior is normal as part of a particular configuration at the IIS?

Regards,