Firewall/Zonealarm

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Sasquatches

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Feb 10, 2003
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Have latest version Zonealarm Pro installed; at grc.com each port is stealthed except port 113 (ident), indicated as closed. realize that port used to establish a connection with another website, however should be able to stealth port 113; a function of my ISP? or can I stealth port in some manner?

Thanks
 
Joined
Feb 9, 2003
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Q: Why is port 113 open? (#225)
A: Port 113 is often left visible by firewalls such as Black Ice Defender, Norton, Defender), since 113 is the IDENT port.
IDENT is used when you connect to mail servers, or to IRC servers, to find out "who" is using the service. With IDENT filtered, your ISP mail server (unlikely) or IRC server (likely) may refuse your request or take a long time to respond as it waits for a closed/open response.

It is possible to remove IDENTD as showing up as a port, by reconfiguring your firewall to over-ride the default rules. As above, if IDENTD is filtered in this way, IRC and mail servers may not work properly.

You can also decide that IDENTD is safe, since just having it visible does not mean there is anything that can be exploited on your side, and live with the less than "perfect" results.

Source ---http://www.dslreports.com/faq/225
 
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