This document describes post-upgrade steps to validate a successful AsyncOS upgrade and troubleshoot common issues on the Cisco Secure Email Gateway (SEG).
Note: Cisco Secure Email Gateway was formerly know as Email Security Appliance.
Note: When firewall access is based on Fully Qualified Domain Names (FQDNs), ensure both Email Security Appliance (ESA) and firewall use the same DNS server for correct hostname-to-IP mapping. The upgrade and update URLs including downloads.ironport.com, upgrades.ironport.com, updates.ironport.com, and manifest URLs are hosted on the Akamai CDN network.
Caution: Cisco Smart Software Licensing usage is mandatory starting with AsyncOS 15.5.x and all future versions for Cisco Secure Email Gateway.
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, ensure that you understand the potential impact of any command.
You must review the compatibility matrix between ESA and SMA before starting the upgrade. Some versions require multiple upgrades to reach the latest release. For upgrade path confirmation and appliance provisioning, contact Cisco TAC.
For AsyncOS upgrade requirements and steps, please refer to the User Guide. Please familiarize yourself with these steps before proceeding.
Reinstalling AsyncOS... 66% 01:05ETA. /usr/local/share/doc/jpeg/libjpeg.doc: Premature end of gzip compressed data: Input/output error tar: Error exit delayed from previous errors. Upgrade failure.
Note: Firewalls must allow idle connections to remain active during the upgrade process.
For hardware appliances, test connectivity to dynamic servers using these commands:
For virtual appliances, test connectivity to these servers using these commands:
Refer to the User Guide for firewall and port requirements.
| Revision | Publish Date | Comments |
|---|---|---|
7.0 |
28-May-2026
|
Updated Formatting to Comply with Cisco's Guidelines for Externalization. |
6.0 |
24-Feb-2026
|
Updating article using KCS methodology and new AsyncOS process. |
5.0 |
17-Apr-2025
|
Added Note Smart License is mandatory for versions 15+ and Components Used section.
Updated SMA Compatibility and Related Info Links, and Formatting. |
3.0 |
14-Sep-2023
|
Updated PII, SEO, Introduction, Machine Translation, Style Requirements and Formatting. |
2.0 |
28-Jul-2022
|
2022 Update |
1.0 |
09-Oct-2014
|
Initial Release |
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