Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Aabuitrago's avatar
Aabuitrago
Icon for Altostratus rankAltostratus
May 15, 2025

Load Balancing IIS Servers

Hi,   I have two IIS Servers that I use to publish multiple sites. I load balance those two IIS Servers through a Big-IP. I recently add a new application on the IIS Servers and for some reason wh...
application delivery
Aabuitrago's avatar
Aabuitrago
Icon for Altostratus rankAltostratus
May 19, 2025

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,

zamroni777's avatar
zamroni777
Icon for MVP rankMVP
May 27, 2025

it's not iis specific, but app specific.
i had encountered some java based http servers had that behavior.