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Forum Discussion

Jeremy_18125's avatar
Jeremy_18125
Icon for Nimbostratus rankNimbostratus
May 30, 2016

F5 ASM AWS backend sending connection reset.

I deployed a couple of F5 WAF in AWS in HA, the backend fails to load on the browser (reset), tcpdump shows we can get to the virtual server, and the curl can reach the web server from the LTM.   ...
ASM Advanced WAF
cloud
Yann_Desmarest's avatar
Yann_Desmarest
Icon for Cirrus rankCirrus
Jun 02, 2016

Hi Jeremy,

Below an irule example I developed in 2014 to achieve the same feature as fqdn nodes : 

when HTTP_REQUEST {
 set host "www.myhostname.com"
 HTTP::collect
  resolv hostname
 NAME::lookup @x.x.x.x $host
}
when NAME_RESOLVED {
 set remoteip [lindex [NAME::response] 0]
 if { $remoteip != "" } {
  node $remoteip 80
 } else {
   log local0. "Hostname resolution failed !!!"
 }
 HTTP::release
}
when LB_FAILED {
  log local0. "Selected server [LB::server] did not respond."
}