Ports are used when any program accesses the Internet so that the system can keep separate applications' data separate. Some port numbers are reserved for functions such as e-mail or FTP. To prevent potential security risks if a protocol was allowed access a port reserved for a seperate protocol, Gecko applications contain a list of banned ports. This preference allows you to unban a port banned by default and therefore prevent the "Access to the port number given has been disabled for security reasons." or "This address uses a network port which is normally used for purposes other than Web browsing. Firefox has canceled the request for your protection." messages.
Possible values and their effects
A comma delimited list of port numbers to allow.
- This preference does not exist by default.
- Unblocking ports may pose a security risk.
First checked in
Has an effect in
- Netscape (all versions since 6.1)
- Mozilla Suite (all versions since 0.9.1)
- Phoenix (all versions)
- Firebird (all versions)
- Firefox (all versions)
- SeaMonkey (all versions)
- Bug 83401 - %0a and %0d are unescaped -> malicious link can send mail
- Bug 85601 - User interface to allow connections to blocked ports