by Victor
4. March 2010 15:32
Yesterday, I set up a testing website on my testing server with port 6000. I tried to browse it with Firefox. I got an error like "This address is restricted. This address uses a network port which is normally used for purposes other than Web browsing. Firefox has cancelled the request for your protection. " Then I tried in the Chrome, I got similar error message as wel. Surprisingly, IE worked fine. This was totally new to me. Then I found out the fact that Mozilla blocks some ports for the security reason. Here is a list of port they blocked :
Port Service
| 1 - tcpmux |
7 - echo |
9 - discard |
11 - systat |
| 13 - daytime |
15 - netstat |
17 - qotd |
19 - chargen |
| 20 - ftp data |
21 - ftp control |
22 - ssh |
23 - telnet |
| 25 - smtp |
37 - time |
42 - name |
43 - nicname |
| 53 - domain |
77 - priv-rjs |
79 - finger |
87 - ttylink |
| 95 - supdup |
101 - hostriame |
102 - iso-tsap |
103 - gppitnp |
| 104 - acr-nema |
109 - POP2 |
110 - POP3 |
111 - sunrpc |
| 113 - auth |
115 - sftp |
117 - uucp-path |
119 - NNTP |
| 123 - NTP |
135 - loc-srv / epmap |
139 - netbios |
143 - IMAP2 |
| 179 - BGP |
389 - LDAP |
465 - SMTP+SSL |
512 - print / exec |
| 513 - login |
514 - shell |
515 - printer |
526 - tempo |
| 530 - courier |
531 - chat |
532 - netnews |
540 - uucp |
| 556 - remotefs |
563 - NNTP+SSL |
587 - submission |
601 - syslog |
| 636 - LDAP+SSL |
993 - IMAP+SSL |
995 - POP3+SSL |
2049 - nfs |
| 4045 - lockd |
6000 - X11 |
|
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For more detail about this you can visit Mozilla's website.
Resolution:
1. If you can decide how to host your website, try to avoid use these ports when you config your website.
2. If you are end user, you can change your configuration to override this setting.
For Firefox, enter about:config in the address bar, and then right-click anywhere in the lower portion of the resulting page and select New and then String from the context menu. The name you need to enter is network.security.ports.banned.override, and the value is the port(s) you want to open. If you have more than one, enter them as a comma-separated list. Or you can just type "1-65535", that will open all ports.
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