Forum Discussion
NimbostratusThe children pool members are down
Hello,
I am new with F5.
When configured F5 to load balancing traffic with SSL feature for Azure VMs, we use Azure load balancer as interface which will receive all traffic from Internet then distribute to F5 and Web backend server.
After created Virtual server, Pool and Node in F5, also enabled Azure NSG rules which allowed communicate between F5 and Web backend, the pool shows that the children pool members are down.
By telnet from another VM to Web backend server, it is said that port service is working well.
Not sure what did we miss with the configuration.
Looking forward to your advice.
3 Replies
- Aswin_mk
MVP
Hello
Please follow below steps and verify - :
from F5 bash
telnet <backend-ip> <service-port>
If fails → NSG/UDR or subnet ACL issue.
Switch pool’s monitor to TCP temporarily → if up, then the SSL/HTTP monitor config is the problem.
If TCP works → configure HTTPS/SSL monitor properly.
Enable SNAT Auto Map on the virtual server to avoid asymmetric routing.
BR
Aswin - Paulius
Is this F5 device deployed in path or in one arm mode?
What does the routing table look like on your F5?
Are you able to perform and HTTP/S get to the respective pool members?
If everything appears to be configured correctly you might take a moment to run a tcpdump on the F5 to see what communication is going back and forth between the F5 and the pool members. - Injeyan_Kostas
Nacreous
Hello,
What type of monitor have you applied?
Are you able to telnet backend servers from F5 cli?
Have define routing in F5?
What type on deployment do you have? 1 interface, 2 interfaces, 3 interfaces?
