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Old 01-29-2013, 09:27 AM   #1
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Registered: Jun 2012
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Sybase connection from Windows

Our DBA's have installed Sybase on to redhat 5.8 and would like to connect to it using ISQL/w.
I have disabled the firewall since it is only an internal server but they still cannot connect.
I also cannot telnet to this port from a PC.

I get the foolowing shown:
/]# nmap -sS -O

Starting Nmap 4.11 ( ) at 2013-01-29 16:00 GMT
Interesting ports on localhost.localdomain (
Not shown: 1672 closed ports
22/tcp open ssh
23/tcp open telnet
25/tcp open smtp
111/tcp open rpcbind
631/tcp open ipp
971/tcp open unknown
5800/tcp open vnc-http
5801/tcp open vnc-http-1

Is there anything else I can do?
Old 01-29-2013, 01:51 PM   #2
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Check for an extensive list of ports Sybase seems to use.

an nmap in "default" mode (nmap -sS -O may not be sufficient.

Which port is referenced when you said "I also cannot telnet to this port from a PC."

telnet localhost <port> from the sybase host should work.

I'd try
netstat -an
netstat -plaunt | grep base
on the sybase host and look for the sybase port (this assumes the service/daemon is started...) then
nmap -sS -O -p 1024-2048
with an additional
nmap -sS -O -p 2049-4096
The goal here is to find a range of IPs and nmap those. Or just use "the port" you mentioned and skip the whole nmap'ing a range, but use nmap -sS -O -p <port_you_mentioned>

If the sybase port is running and they still cannot connect, they should try
ping <server_name>
ping <IP>
to verify "They" can 'see' the server from client PCs.

Are they behind a corporate firewall, or other another device that may be "in the way"? (Not a firewall as you mentioned)

Please let us know...

Last edited by Habitual; 01-29-2013 at 01:53 PM.
Old 01-29-2013, 07:03 PM   #3
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You need to look at the network addr (eg as used by eth0).


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