Communication
Mattermost
Mattermost is an open-source team messaging platform designed for security-conscious organizations, offering self-hosted or cloud deployment with deep DevOps integrations.
What is Mattermost?
Mattermost occupies a specific and deliberate niche in the team messaging market: it's the open-source, self-hostable alternative for organizations that cannot or will not send their communications through a third-party SaaS platform. Founded in Palo Alto in 2015 and originally developed by a gaming company before being open-sourced, Mattermost found its primary market among government agencies, defense contractors, financial institutions, healthcare organizations, and large enterprises with strict data sovereignty requirements. The US Department of Defense has been a notable Mattermost customer, as have multiple national intelligence agencies.
The platform is a classic open-core product: the Community Edition is freely available under an MIT license and can be deployed on any infrastructure the customer controls — on-premises servers, private cloud, air-gapped networks. The Enterprise Edition adds compliance features, advanced access controls, LDAP group synchronization, and high-availability deployment support. Mattermost also offers a hosted cloud option (Mattermost Cloud) for organizations that want managed infrastructure without self-hosting complexity. The technical stack is built on Go for the server and React for the web frontend, with mobile apps in React Native.
The failure modes for Mattermost are strongly bifurcated by deployment type. For self-hosted installations, outages are usually infrastructure problems on the customer's side — a database failure, a certificate expiry, a misconfigured reverse proxy — rather than Mattermost cloud incidents. For Mattermost Cloud customers, a service outage means message delivery fails, channels become unresponsive, and file uploads return errors. Real-time WebSocket connections drop, causing the desktop and mobile clients to enter offline mode. For organizations using Mattermost as their primary operational coordination channel — particularly in defense and government contexts where it may be the only approved platform — a messaging outage has direct mission impact.
Outage.gg tracks Mattermost Cloud's service health in real time. Visit the live status page to check current platform status.
Common Mattermost Problems
Issues users most frequently report when Mattermost is having problems.
Messages not sending
Messages appear stuck, fail to deliver, or recipients are not receiving them.
Login & authentication
Unable to sign in, 2FA not working, or being unexpectedly logged out.
Feed & content not loading
Posts, stories, or notifications are not appearing or are failing to refresh.
App & website errors
The app or website returns error pages, crashes, or is completely unreachable.
Frequently Asked Questions
Common questions about Mattermost outages and server status.
You can check the live Mattermost server status at outage.gg/services/mattermost. The page shows real-time community-submitted outage reports, an hourly trend chart, and the current health status.
Mattermost can stop working for a number of reasons including scheduled maintenance windows, unexpected server failures, network infrastructure problems, or DDoS attacks. Check the live status page on Outage.gg for the latest community reports to see if others are experiencing the same issue.
Go to outage.gg/services/mattermost and click the "Report an Issue" button. Your report is counted immediately and helps confirm whether a problem is widespread. Reports from multiple users trigger a status change visible to everyone watching the page.
Click the "Notify Me" bell button on the Mattermost status page at outage.gg/services/mattermost. Create a free account and we will send you an email the moment Mattermost comes back online — no app download required.
Many services maintain official status pages with planned maintenance notices. Outage.gg aggregates real-time community-reported outages which often surface faster than official channels.
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