Remote system not responding after installing firewall

HCL Domino Domino Forum
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Hi,I need help with a problem after installing a firewall (Sygate 5.1) on one computer. The client on this computer cannnot get any connection to the Domino servers (“Remote system not responding”) although the server is up and running properly, it can be connected by a client without a firewall. Here are some facts:

  • on the server side nothing has been changed

  • all computers (WIN2000, one is WIN XP prof.) can be pinged properly.

  • there connection documents set up properly

  • there is also no connection even the firewall is switched off

  • I can gain access from the firewall computer to another one via the windows network but not the other way round.

  • Netbios over TCP/IP is switched on on all computers I try to get a connection to (normaly a plain TCP/IP connection is used).

  • I try to gain access client to server both via TCP/IP and Netbios (LAN0).

Can it be that the firewall changed a registry setting?

What can I do? All hints and tips are appreciated very much.

Kind regards, Peter

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Subject: Remote system not responding after installing firewall

You’ll need to make sure port 1352 is open and allowing the host computer to send/recieve network traffic on it.

1352 is the TCP port all Notes client to server and server to server communication occurs on.

  • Matt
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Subject: RE: Remote system not responding after installing firewall

Does port 1352 need to be open to receive unsolicited requests for replication or connection thru a firewall?

Our firewall allows all outgoing TCP traffic on port 1352 and also once an outbound connection is established, we allow inbound traffic on the same connection between the two endpoints.

This configuration, however is not working, as the connection is terminated and we receive a “Remote system no longer responding” error message.

Can anyone verify that my configuration above SHOULD work?

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Subject: RE: Remote system not responding after installing firewall

Thanks for the response, Matt.There is no connection even the firewall is terminated.

Can it be that port 1352 is closed even the firewall is down?

Regards, Peter

5

Subject: RE: Remote system not responding after installing firewall

Getting in a little over my head here, but I do have a few questions:

Do you have two NIC’s in the firewall PC? Most firewalls require this configuration. If that’s the case, turning off the firewall software won’t solve all your problems.

You’ll need to set up a route using the correct NIC to allow you to contact the server in question.

In this scenario, ping and tracert should both fail to find the server as well. If you drop to a command line and run tracert to the the server, what do you get?

If you remove one of the NIC’s and leave the NIC in that’s on the right side of the network. Does tracert start working after a reboot?

Are you using DHCP on the PC?

Can you ping/tracert to other PC’s/Servers on the same IP network the server is on?

  • Matt
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Subject: RE: Remote system not responding after installing firewall

Hi Matt,<Do you have two NIC’s in the firewall PC?>

… no, just one.

<If you drop to a command line and run tracert to the the server, what do you get?>

… a ping on the computer itself works fine.

<Are you using DHCP on the PC?>

… no

<Can you ping/tracert to other PC’s/Servers on

the same IP network the server is on?>

… yes

Once again thanks a lot for your replies.

Regards, Peter

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Subject: RE: Remote system not responding after installing firewall

It sounds like we’ve established you don’t have a TCP/IP routing issue.

Next thing would be to run a port Trace from the Notes client on the firewall PC.

Cut and paste the trace log output here.

To run it, File-Preferences-User Preferences-Ports-Trace.

  • Matt