Error: The transport failed to connect to the server

HCL Domino Domino Forum
1

Hello all,

I have a Domino server running the SMTP service in the DMZ zone. There are no complaints about users not able to send/receive external outbound messages except for an application.

This application is running a batch job created on an IIS server that loops to query some result from a backend database. When it is executed, there are various call to send mail via the SMTP server. The mail sometimes work and sometimes doesn’t work; its intermittent.

If it errors out, the errors are as follow:-

{

Could not access ‘CDO.Message’ object.

Here is the full error message output

System.Web.HttpException: Could not access ‘CDO.Message’ object. —> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.Runtime.InteropServices.COMException (0x80040213): The transport failed to connect to the server.

— End of inner exception stack trace —

}

Could someone advise me what I should check on the Domino server running the SMTP service? All the other Domino mail servers are working fine - both for internal and external mail messages. I need to have a clue to start troubleshooting this issue. If someone have any ideas or links to help me, much appreciated.

Thanks in advance.

Teck Lung

2

Subject: Error: The transport failed to connect to the server.

Teck, did you ever hear anything back? We are experiencing the same issue/error messages with one of our home grown apps as well. The error seemed to go away when we removed the firewall between the two servers (one was on DMZ and one wasn’t). I have a feeling our issue is firewall related. Maybe you can try testing yours with an SMTP server on the same network to see if that resolves your issues as well.