User-Agent redirect to use any browser except IE

Clarify your question a bit, please. You want to redirect based on browser, or you want IE to be forcibly changed to Firefox or Chrome?

One is easy but unreliable, the other isn't possible.

We would like IE to be forcibly changed to Firefox or Chrome.

Not going to be possible for so many security reasons.

Perhaps an alternative is to redirect IE to a website declaring the requirement for Firefox or Chrome and providing links for download.

Basically you want an end user to trust your/any website to run arbitrary code on their PC. I think you can see the security problem that would present.

We currently have a webserver that is performing this. They want to utilize the F5 to perform it. Here is the server script.

That is horrifying. I can't imagine F5 is going to let you emulate that in an iRule.

To echo ekaleido's words, I never knew you can force a client machine to pick another browser. You could end up breaking any security/compliance posture. Sorry, not being helpful with the actual question but found this conversation interesting.

The scary part is that is a functional piece of IE (note it's called by a hook into ActiveX) and it could potentially be used to run ANY piece of arbitrary code.

you can try this irule:

when HTTP_REQUEST {
    Check if the URI is /maintenance
   if {[string tolower [HTTP::header "User-Agent"]] contains msie} {
          Send an HTTP 200 response with a Javascript
         HTTP::respond 200 content \
"Browser redirectinsert your code herebody>\
Wrong browser, we will try to start a real internet browser :)" "Content-Type" "text/html" 
         return
      }
   }
}

Stanislas :)