Cisco Cisco ASA 5540 Adaptive Security Appliance 문제 해결 가이드
ASA ESMTP and SMTP Inspection Do Not Allow
Certain Commands over Telnet
Certain Commands over Telnet
Document ID: 113423
Contributed by Magnus Mortensen, Cisco TAC Engineer.
Sep 16, 2013
Sep 16, 2013
Contents
Introduction
Prerequisites
Requirements
Components Used
Conventions
Problem
Solution
Related Information
Prerequisites
Requirements
Components Used
Conventions
Problem
Solution
Related Information
Introduction
This document describes the best way to troubleshoot connectivity problems with SMTP and ESMTP traffic
through an ASA.
through an ASA.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on the Cisco 5500 Series Adaptive Security Appliance (ASA).
The information in this document was created from the devices in a specific lab environment. All of the
devices used in this document started with a cleared (default) configuration. If your network is live, make sure
that you understand the potential impact of any command.
devices used in this document started with a cleared (default) configuration. If your network is live, make sure
that you understand the potential impact of any command.
Conventions
Refer to Cisco Technical Tips Conventions for more information on document conventions.
Problem
When you test an email server through Telnet on the ASA and ESMTP or SMTP inspection is enabled, certain
commands, such as HELO or EHLO, return a 550 error that indicates the command is not understood. When
ESMTP or SMTP inspection is disabled, the commands are understood.
commands, such as HELO or EHLO, return a 550 error that indicates the command is not understood. When
ESMTP or SMTP inspection is disabled, the commands are understood.
Solution