IronPort - daily management guide - AsyncOS 7.6.1

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Troubleshooting Delivery 9-28 Cisco IronPort AsyncOS 7.6 for Email Daily Management Guide Chapter 9 Testing and Troubleshooting When you sort by Connections Out, does any one domain reach the maximum connections specified for a listener? The default maximum number of connections for a listener is 600. The default maximum system-wide number of connections if 10,000 (set by the deliveryconfig command). You can examine the maximum number of connections for a listener using the command: listenerconfig -> edit -> injector_number -> limits Are the connections for a listener further limited by the destconfig command (either by system maximum or by Virtual Gateway addresses)? Use this command to examine the destconfig connection limits: destconfig -> list Use the hoststatus command. “Drill-down” using the hoststatus command on the top domains listed from the results listed by the tophosts command. Is the host available and accepting connections? Are there problems with one specific MX record mail server for the given host? The hoststatus command reports the last “5XX” status code and description returned by the host if there is a 5XX error (Permanent Negative Completion reply) for the specified host. If the last outgoing TLS connection to the host failed, the hoststatus command displays the reason why it failed. Configure and/or examine the domain debug, bounce, and text mail logs to check if the recipient host is available. Domain debug logs record the client and server communication during an SMTP conversation between the appliance and a specified recipient host. This log file type can be used to debug issues with specific recipient hosts. For more information, see Using IronPort Domain Debug Logs, page 5-22. Bounce logs record all information pertaining to each bounced recipient. For more information, see Using IronPort Bounce Logs, page 5-17. Text mail logs contain details of email receiving, email delivery and bounces. Status information is also written to the mail log every minute. These logs are a useful source of information to understand delivery of specific messages and to analyze system performance. For more information, see Using IronPort Text Mail Logs, page 5-8. Use the telnet command to connect from the appliance to the problem domain: mail3.example.com> telnet Please select which interface you want to telnet from. 1. Auto 2. Management (192.168.42.42/24: mail3.example.com) 3. PrivateNet (192.168.1.1/24: mail3.example.com) 4. PublicNet (192.168.2.1/24: mail3.example.com) [1]> 1 OL-25138-01
Chapter 9 Testing and Troubleshooting OL-25138-01 Enter the remote hostname or IP. []> problemdomain.net Enter the remote port. [25]> 25 Troubleshooting Delivery You can use the tlsverify command to establish an outbound TLS connection on demand and debug any TLS connection issues concerning a destination domain. To create the connection, specify the domain to verify against and the destination host. AsyncOS checks the TLS connection based on the Required (Verify) TLS setting. mail3.example.com> tlsverify Enter the TLS domain to verify against: []> example.com Enter the destination host to connect to. Append the port (example.com:26) if you are not connecting on port 25: [example.com]> mxe.example.com:25 Connecting to 1.1.1.1 on port 25. Connected to 1.1.1.1 from interface 10.10.10.10. Checking TLS connection. TLS connection established: protocol TLSv1, cipher RC4-SHA. Verifying peer certificate. Verifying certificate common name mxe.example.com. TLS certificate match mxe.example.com TLS certificate verified. TLS connection to 1.1.1.1 succeeded. Cisco IronPort AsyncOS 7.6 for Email Daily Management Guide 9-29
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IronPort - daily management guide - AsyncOS 7.6.1

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