Outage in Tessian US

Intermittent Gateway Delivery Issues — [451 ECONNREFUSED]

Resolved Minor
May 12, 2025 - Started 7 months ago - Lasted about 23 hours

Incident Report

Beginning May 8th, we have observed intermittent issues affecting some customer's message delivery through the Tessian Gateway. A subset of customers may experience messages being blocked with error code 451 ECONNREFUSED when their mail server tries to connect to their Tessian Gateway.   Our engineering team is actively investigating the issue.  You can confirm by logging into your Tessian Portal: Integrations > Email Deployments > Gateway > Alerting to check deliveries via Gateway Alerting Page.    If impacted, we would recommend you temporary disable routing mail through the Tessian Gateway and contact support for priority remediation.

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Latest Updates ( sorted recent to last )
INVESTIGATING 7 months ago - at 05/12/2025 09:26PM

Our Engineering team has taken remediation steps for impacted customers. They continue to investigate the initial cause.
If you continue to notice issues with your gateway, please raise a case so we can prioritize.

INVESTIGATING 7 months ago - at 05/12/2025 05:00PM

Beginning May 8th, we have observed intermittent issues affecting some customer's message delivery through the Tessian Gateway. A subset of customers may experience messages being blocked with error code 451 ECONNREFUSED when their mail server tries to connect to their Tessian Gateway.  

Our engineering team is actively investigating the issue. 

You can confirm by logging into your Tessian Portal: Integrations > Email Deployments > Gateway > Alerting to check deliveries via Gateway Alerting Page.   

If impacted, we would recommend you temporary disable routing mail through the Tessian Gateway and contact support for priority remediation.

Latest Tessian US outages

M365 Add-In: Silently failing checks for a subset of users - 12 days ago
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M365 Add-in impacted by Microsoft Azure Service Incident - 2 months ago
Delayed Events I&R - 3 months ago
Some Adaptive Email DLP Events slow to show in Security Events - 4 months ago

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