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A comment on 65k Open TCP Ports. Parent comment

Re:65k Open TCP Ports by rwmj on Thursday October 20, 2011 @03:38AM (#3133872)
Firefox is blocking port 25 with a warning message.
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Re:65k Open TCP Ports by Luyt on Thursday October 20, 2011 @04:27AM (#3133977)
"This address is restricted

This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection. "

This 'port banning' is described in http://www-archive.mozilla.org/projects/netlib/PortBanning.h..., and the page at http://agiletesting.blogspot.com/2008/09/getting-around-fire... describes how you can use about:config to disable the blocking:

"1) go to about:config in the Firefox address bar

2) right click, choose new->string

3) enter the name network.security.ports.banned.override and the value '1-65535' (without the quotes) "

I tried it, and it worked: http://open.zorinaq.com:25/

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