FB_FAILED is occurring even if all the server nodes are available. In the iRule logged the [event info] but noting is coming.
Is there any way to identify or diagnose the reason for this?
The tcp profile associated with the virtual server has "Maximum Syn Retransmissions" set to 3 currently.
The tcp monitor is having interval set to 5 secs and timeout set to 16 secs.
Will increasing the "Maximum Syn Retransmissions" or monitor timeout or interval improve on this?
make sure your pool members have a route back via F5, sounds like a routing issue. LB_FAILED happens when the TCP handshake to the pool member is not completed successfully.
Try enabling auto-snat
I’m guessing you are using gateway_icmp as a health monitor (which is connectionless). This will mark your pool up, however a TCP connection might fail as it require a working return path via the F5
Hei Maria, we are now encountering the similar issue where BigIP works as load balancer before 3 LDAP servers. It'll be really appreciated if you could share your solution with me. Thanks in advance!
We do have the same situation here: all PoolMember show UP, iRule event LB_Failed gets triggered and Event_Info is empty 😞
Max_Syn_Retransmit is set to 5 - no difference.
We do SNAT, so return path is fine ...
Could you please share your solution? Thanks in advance!