It seems like your browser didn't download the required fonts. Please revise your security settings and try again.
Barracuda Campus Barracuda Campus

Back to Knowledgebase

What happens to incoming mail when the firmware on a Email Security Gateway is updated during business hours?

  • Type: Knowledgebase
  • Date changed: one year ago
Solution #00001489

Scope:
This solution applies to all Email Security Gateways.

Answer:
During a firmware update, the Email Security Gateway will undergo a quick reboot.

During this time, the MTA (Mail Transfer Agent) will be restarted. If the MTA is not listening on port 25, a connecting server would receive a "Connection Refused". As a result, they would retry at their next scheduled retry interval (this is an independent value based on the sending server's configuration).

Additional Notes:
To control this process a little more, you could go to the Basic > Administration page and take the box offline (by clicking the Offline button) prior to upgrading the firmware. This will:
  1. Help make sure mail does not get lost.
  2. Speed up the upgrade process.
After the box reboots, once the firmware has been upgraded, go back to the Basic > Administration page and bring the box back online (by clicking the Online button).

Link to This Page:
https://campus.barracuda.com/solution/50160000000GSg6AAG