Port checking using Javascript

[Mattys067]

Im curious if there is a way to check blocked ports in Javascript to determine whether or not there is a firewall present? I have seen many sites that accomplish this but have been unable to recreate it myself? Any help would be much appreciated! Thanks in advance!

[A1ien51]

You are not going to be able to do this with JavaScript....

[Mattys067]

Is there a language I can use to check port 554 or any firewall related port for that matter???