“Error: too many connections” message appears when sending a large amount of emails in Hosted Email Security (HES)

- Updated:
- 25 Jan 2017
- Product/Version:
- Hosted Email Security 3.0
- Platform:
- Not Applicable N/A

Summary

When you send a large amount of outgoing emails, the HES relay server rejects them and you get the following error message:

421 4.7.0 in08.sjc.mx.trendmicro.com Error: too many connections from216.24.228.26

Details

The issue occurs because your outgoing MTA opening has more than four (4) concurrent connections. The limit set in each inbound MTA is 4 concurrent connections for each client.

To resolve the issue, configure your outgoing MTA to open not more than 4 concurrent connections.

Rating:

Category:

Configure; Troubleshoot

Solution Id:

1038586

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