Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I want to know whether the below 3388 port is blocked by firewall or it is engaged with some other services. Could you please suggest on this.

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

D:\Documents and Settings\32323>telnet xfjdd.og.com 3388
Connecting To xfjdd.og.com...Could not open connection to the
host, on port 3388: Connect failed

D:\Documents and Settings\32323>
share|improve this question

closed as not a real question by HopelessN00b, squillman, joeqwerty, Dave M, RobM Aug 16 '12 at 8:45

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer 1

By no means a hard and fast rule but, typically, if it sits on the 'Connecting to...' message for a short while, it is blocked by the firewall; while if it instantly goes past that and says 'Connect failed', the server has actively decided not to respond (either because the port is not open, or the service rejects your initial connection).

An old Windows command-line app called PortQry (http://support.microsoft.com/kb/310099) used to do the job quite nicely, with a FILTERED response for blocked by firewall and a NOT LISTENING response for server rejection.

Otherwise, you should familiarise yourself with Nmap (http://nmap.org/); it uses FILTERED when blocked by a firewall and CLOSED when the server rejects.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.