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Top Forums UNIX for Dummies Questions & Answers How to check the TCP/UDP port of a connection Post 302073816 by tayyabq8 on Thursday 18th of May 2006 12:55:24 AM
Old 05-18-2006
Host refused connection

Hi,

Actually, I want to know the port where the remote party is coming from. Any ways, I checked my syslog after logging in from the same client and found the following:
Code:
May 17 15:53:43 unix1 in.telnetd[10742]: connect from AGB

It means my KCML client, comes thru telnet(TCP port 23), I forwarded this port 23 from my router to UNIX box(for Remot users i.e. comming from the internet), it reaches UNIX because I can see its log in syslog. But client gets "Host refused connection". There is no problem for the connections comming from local subnet or from the subnets for routes are already added. I checked my /etc/inetd.conf file and found following there:
Code:
telnet  stream  tcp     nowait  root    /usr/sbin/in.tcpd       in.telnetd
telnet  stream  tcp     nowait  root    /usr/sbin/in.telnetd    in.telnetd

So this is not the problem either, as well as hosts.allow has the entry to allow telnet comming from unknown host. I tried to telnet UNIX box from the Internet, but no luck. My default gateway is set properly also and system accepts connections from VPN without any problem, so there is no problem for the connections from unknown hosts.

And I don't know also where system logs the record of rejected connections. I'm totally blank here. Any idea.....

FYI, I'm at SCO UNIXWARE 7.1.1.


Regards,
Tayyab

Last edited by tayyabq8; 05-18-2006 at 02:08 AM..
 

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TCPDMATCH(8)						      System Manager's Manual						      TCPDMATCH(8)

NAME
tcpdmatch - tcp wrapper oracle SYNOPSIS
tcpdmatch [-d] [-i inet_conf] daemon client tcpdmatch [-d] [-i inet_conf] daemon[@server] [user@]client DESCRIPTION
tcpdmatch predicts how the tcp wrapper would handle a specific request for service. Examples are given below. The program examines the tcpd access control tables (default /etc/hosts.allow and /etc/hosts.deny) and prints its conclusion. For maximal accuracy, it extracts additional information from your inetd network configuration file. When tcpdmatch finds a match in the access control tables, it identifies the matched rule. In addition, it displays the optional shell com- mands or options in a pretty-printed format; this makes it easier for you to spot any discrepancies between what you want and what the pro- gram understands. ARGUMENTS
The following two arguments are always required: daemon A daemon process name. Typically, the last component of a daemon executable pathname. client A host name or network address, or one of the `unknown' or `paranoid' wildcard patterns. When a client host name is specified, tcpdmatch gives a prediction for each address listed for that client. When a client address is specified, tcpdmatch predicts what tcpd would do when client name lookup fails. Optional information specified with the daemon@server form: server A host name or network address, or one of the `unknown' or `paranoid' wildcard patterns. The default server name is `unknown'. Optional information specified with the user@client form: user A client user identifier. Typically, a login name or a numeric userid. The default user name is `unknown'. OPTIONS
-d Examine hosts.allow and hosts.deny files in the current directory instead of the default ones. -i inet_conf Specify this option when tcpdmatch is unable to find your inetd.conf network configuration file, or when you suspect that the pro- gram uses the wrong one. EXAMPLES
To predict how tcpd would handle a telnet request from the local system: tcpdmatch in.telnetd localhost The same request, pretending that hostname lookup failed: tcpdmatch in.telnetd 127.0.0.1 To predict what tcpd would do when the client name does not match the client address: tcpdmatch in.telnetd paranoid On some systems, daemon names have no `in.' prefix, or tcpdmatch may need some help to locate the inetd configuration file. FILES
The default locations of the tcpd access control tables are: /etc/hosts.allow /etc/hosts.deny SEE ALSO
tcpdchk(8), tcpd configuration checker hosts_access(5), format of the tcpd access control tables. hosts_options(5), format of the language extensions. inetd.conf(5), format of the inetd control file. AUTHORS
Wietse Venema (wietse@wzv.win.tue.nl), Department of Mathematics and Computing Science, Eindhoven University of Technology Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands TCPDMATCH(8)
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