Firewall Detection

[Shilohcity]

Hi there

I was wondering if anybody had any experience with detecting whether a client is browsing from behind a firewall?

I am finding that some visitors to mys site have had Javascript disabled by their firewall software and as a result have all kinds of weird errors however the <noscript> tag doesn't pick this up as it is checking the browser where Javascript is turned on not the firewall software.

As always all thoughts and suggestions appreciated.

Cheers

Justin X-) &quot;Creativity is the ability to introduce order into the randomness of nature.&quot; Eric Hoffer

Visit me at

http://www.dfodesign.co.nz

 

[tviman]

I think you've answered your own question. Firewalls aren't supposed to be detectable from the outside.

The odd thing is firewall turning off javascript. If <noscript> isn't seeing it them how can it be set to javascript off? Doesn't make sense.

Maybe a call to the makers of these firewalls might help? There's always a better way...

 

[KevinAr18]

Although you can't detect if they are using firewalls, what about some kind of detecting to make sure javascript is working?

 

[starway]

You cannot verify if JS is enabled. But you can serve the suitable content using &quot;side effects&quot; of JS work.

One possible solution: JS-based redirect to another page (loaded with scrpits), while the opening page stays scripts-free.

Second: using <noscript> tag.

 

[trollacious]

I believe that the <noscript> tag just checks to see if scripting is enabled in the browser, not whether the script has been stripped out by some external software. The only method I can imagine that works is the page redirection if scripting is enabled and the script is still there.