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

Forum Discussion

Paul_108843's avatar
Paul_108843
Icon for Nimbostratus rankNimbostratus
Aug 16, 2011

Lync A/V not working

IM working fine.   disabled SNAT on AV pools and VIP   can't telnet to VIP 443 from external. Can telnet if I enable SNAT.     Any workaround suggestion?     Thanks  
microsoft
partner
Ryan_Korock_46's avatar
Ryan_Korock_46
Historic F5 Account
Aug 16, 2011
Paul, this sounds like a routing issue. Because of the way you have the network architected, it is possible that your Edge Servers need SNAT in order to pass the response packets back through the BIG-IP.

 

 

The recommended architecture from F5 is having the BIG-IP be the default gateway of the Edge Servers, ensuring response packets get sent back through the BIG-IP.