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

Forum Discussion

ciscozest_30697's avatar
ciscozest_30697
Icon for Nimbostratus rankNimbostratus
Aug 03, 2018

iRule cannot fetch iFile (wpad.dat)

I am having issue with iRule. Once it is applied to VS, I cannot access internet anymore and always got error message "You've asked for something we don't have" which is the default event from iRule....
application delivery
cloud
irules
Samir_Jha_52506's avatar
Samir_Jha_52506
Icon for Noctilucent rankNoctilucent
Aug 04, 2018

Just guessing, Suspecting issue with external data source 

hxxp://x.x.x.x/MDD/wpad.dat
.

In this case iRule iFile is searching details inside F5 directory 

/config/filestore/files_d/Common_d/ifile_d

Can you import wpad.dat file in F5 and run @AMG's iRule.

System > File Management--> iFile List --> Import

Hope will work...

Cheers...

Andy_McGrath's avatar
Andy_McGrath
Icon for Cumulonimbus rankCumulonimbus
Aug 07, 2018

Should be no issue with the iFile as simply plain text.

Is the iFile and the Virtual Server you are assigning the iRule to in the same partition, i.e. both in partition named 'MDD'?

If you try the following, removing the partition reference:

when HTTP_REQUEST {
  switch -glob [string tolower [HTTP:uri]] {
    "/mdd/wpad.dat" {
      HTTP::respond 200 contain [ifile get wpad.dat] "Content-Type" "application/x-ns-proxy-autoconfig" "pragma" "no-cache"
    }
    default {
      HTTP::respond 404 content "You've asked for something we don't have."
    }  
  }
}

Failing this can you run the folllowing and share the output:

tmsh list sys file ifile /MDD/wpad.dat
tmsh list ltm ifile /MDD/wpad.dat