Red Hat AS 2.1 and Exceed

[Tonatiuh]

I have installed in a Windows PC he Hummingbird Excedd (evaluation version 10). But I cannot open a session to my RH AS 2.1 server.

There are no firewall between both machines, just a NAT.

Any idea about what could be wrong?

[Nobody's Hero]

There could be many reasons why. Can you be more specific. Display an error message or a clue.

Remember to supply points to people who help youon this forum. YOu might get a better response even though the main purpose is to help educate. Points please.

[Steven E. Protter]

The default insall or RH AS 2.1 has a firewall that blocks the ports that Exceed needs open.

I think its port 7000.

You need to open up the ports in iptables ir ipchains and it should work.

SEP

[Tonatiuh]

No errors are showed. I run the "XDMCP Broadcast" and it shows a timeout wihtout discovering any node.

I did not activate the Firewall protection in the installation process. There is no firewall in the server (software) and no firewall between my PC and the server.

I have tryed wiht the X Client Wizard but in all cases I receive the error message: Unable to connect to host using the specified start method.

[Ermin Borovac]

Can you see xdmcp entry in the output of netstat?

# netstat -a | grep xdmcp
udp 0 0 *:xdmcp *:*

If not, then enable it by either running gdmsetup (XDMCP tab) or editing /etc/X11/gdm/gdm.conf (see below).

[xdmcp]
Enable=true

Assumption I made is that you are using gdm (GNOME display manager) on RHAS 2.1 server.

[Tonatiuh]

I have set xdmcp to true as ermin explained:
[xdmcp]
Enable=true

#netstat -a |grep xdmcp
udp 0 0 *:xdmcp *:*

But the problem is exactly the same.

Reviewing:

I have set this values in the "Exceed X Client Wizard":

Host: MyServer_IP
Host Type: LINUX
Select method: REXEC (TCP/IP)

In the application Section (I use the default values):
XTerm
Application: @(XTerm, method=stdappdb)
Parameters: -display @d&@;

I check the Display Host Replies and click Run (to tray to connect).

It shows me an error message:
"Unable to connect to host using the specified start method."

Any another idea about my problem?

[Rick Garland]

Issue the commands as root user:

service iptables stop
service ipchains stop

During the install you have the option to choose the level of firewall on the RH server itself. The ipchains and iptables.

Even setting to a medium or low level will block access to the ports you are trying to use.

With no server firewall in place, Exceed works fine with RH Linux.

[Tonatiuh]

I have configured "No Firewall" when install. So that, the problem is not that.

Any other idea?

[Rick Garland]

Is there an option to connect using SSH? The REXEC does not exist on Lnux by default. Other option would be to install telnet and enable it and then use the telnet start option in Exceed.

[Tonatiuh]

I am able to connet using the Telnet which comes with the Exceed.

Can I view the graphic desktop of the Linux using SSH? I need to run (on the Linux server) GUI programs from my Windows PC.

[Vitaly Karasik_1]

1) is GDM running?

ps -ef|grep dm

2) please try to check open ports on your RHEL2.1 from another hosts [nmap]

[Vitaly Karasik_1]

what is your Exceed settings?
in Exceed 6-8 default mode is "passive", and you should set "XDMCP broadcast" or "XDMCP query"

[Tonatiuh]

[root@RAC2 root]# ps -ef|grep dm
root 977 1 0 12:22 ? 00:00:00 sendmail: accepting connections
root 1125 1 0 12:23 ? 00:00:00 /usr/bin/gdm -nodaemon
root 1133 1125 0 12:23 ? 00:00:00 /usr/bin/gdm -nodaemon
root 1134 1133 1 12:23 ? 00:01:33 /etc/X11/X :0 -auth /var/gdm/:0.
root 2201 2153 0 14:44 pts/1 00:00:00 grep dm

I do not know how to check open prts? could you please show me the command to do that?

I do not know where to check the Exceed mode, could you please say me where too?

[Vitaly Karasik_1]

1) nmap linux_host - for checking open ports [nmap is installed on linux, I don't remember what portscanner is available on Windows]

2) Run Xconfig, "Network and communication"/XDMCP query/ configure and set your linux hostname in "connect host" field

[Tonatiuh]

[root@RAC2 root]# nmap 172.16.11.28

Starting nmap V. 2.54BETA22 ( www.insecure.org/nmap/ )
Interesting ports on RAC2 (172.16.11.28):
(The 1537 ports scanned but not shown below are in state: closed)
Port State Service
21/tcp open ftp
22/tcp open ssh
23/tcp open telnet
111/tcp open sunrpc
6000/tcp open X11


Nmap run completed -- 1 IP address (1 host up) scanned in 0 seconds

I have configured the XDMCP Query and the problem is still there.