XCON: MTA Generates a Large Number of Event ID 4293 (252843)

SYMPTOMS

Mail backs up in the queues, and the message transfer agent (MTA) generates a large number of the following Event ID 4293:

Event ID: 4293
Source: MSExchange MTA
Type: Warning
Category: Field Engineering

(POP4 POP4 UP(7) PROC 39) Incoming Connection rejected due to an incorrect T-selector. Called T-Selector is: %1%2%3

CAUSE

This problem occurs if T Selector values are mismatched either on incoming or outgoing connections. You can find the X.400 transport selectors in the Microsoft Exchange Server Administrator program in the three following configuration fields:

Stack T Selector. To find this configuration field, perform the following steps:
1. Click to expand Site, click to expand Configuration, click to expand Servers, and click the Server object.
2. In the right pane, a protocol stack in the following form is displayed:
  TCP(server name)
  The following is a sample protocol stack:
  TCP(Server1)
Outgoing T Selector. To find this configuration field, perform the following step:
Click to expand Site, click to expand Configuration, click to expand Connectors, and in the right pane, click your X.400 Connector. Click the Stack tab; this tab has both an Outgoing and Incoming section for transport values.
Incoming T Selector. To find this configuration field, perform the following step:
Click to expand Site, click to expand Configuration, click to expand Connectors, and in the right pane, click your X.400 Connector. Click the Stack tab; this tab has both an Outgoing and Incoming section for transport values.

RESOLUTION

Although a T Selector value is optional, if you do use this value you must make sure that it is an exact match with the corresponding value that is specified for the transport selector on the target Microsoft Exchange Server computer. If a remote administrator wants to specify an S Selector or a P Selector, the remote administrator must only do so after successful messaging has been established. The T, S, and P Selectors are supported between Exchange Server computers.