Why do browsers block some ports?

Question

I\'m playing around with websockets and it appears, that all browsers with native websocket support I tested with (Safari, Chrome) block some ports. If I try to connect to m

Answer 1

For the completeness of the answer, a more complete list can be found on those links :

• http://www-archive.mozilla.org/projects/netlib/PortBanning.html
• http://code.google.com/p/browsersec/wiki/Part2#Port_access_restrictions