The Mattermost desktop app is an Electron wrapper around the web app project. It lives in the mattermost/desktop repository. The desktop app runs on Windows, Linux, and macOS. Mattermost is secure, workplace messaging from behind your firewall. Discuss topics in private groups, one-to-one or team-wide - Find what you're looking for with full text search, filters and #hashtags - Easily share images, video, audio and files - Personalize your experience with custom colors, formatting and fonts - Connect in-house systems with webhooks and Slack-compatible integrations.

1. Mattermost Download
2. Mattermost Format
3. Mattermost Chat
4. Mattermost Exploit

Mattermost Download

What do I need to do?

If you were previously clicking the AF Portal Login button to log in:

Your account has been automatically migrated to P1 SSO. You will now use the 'Platform One SSO' button to log in. If need also need the ability to log in without a CAC, you can set up a password and multi-factor authentication (MFA) on your account by going to https://login.dso.mil/ to access your profile. From here, click the 'Password' tab to set a password. You will also need to click the 'Authenticator' tab to set up multi-factor authentication (MFA).

If you click the Platform One SSO button to log in:

If you currently log into Mattermost using P1 SSO (username/password/MFA), you now have the option to enable the CAC sign in. This allows you to log in using a username/password/MFA or a CAC. To set up CAC login:

1. Insert CAC into the CAC reader. Ensure the lights stop flashing before continuing.
2. Navigate to https://login.dso.mil.
3. You will be prompted to authenticate with the CAC. The first time you do this, you will receive a message stating a new DoD CAC was detected. Log in using your username, password and MFA at which point you will recieve a prompt to confirm your CAC (pictured below) which will associate it with your P1 SSO account. Now when you sign in from a computer with a CAC, you will simply authenticate using the CAC.
4. You may now navigate to https://chat.il4.dso.mil or https://chat.il2.dso.mil for the appropriate chat server you are on, and should be automatically logged into MatterMost
5. From now on when you click the Platform One SSO button to login to Mattermost it will attempt use CAC to authenticate if it is inserted. If not, it will require you to enter username, password, and MFA.

NOTE: The Mattermost desktop client has a known issue where it will ask for CAC regardless if it's inserted and will not allow username/password login. Use a web browser until the issue is resolved.

If you are a Mattermost user that hasn't logged in for a while:

Mattermost Format

If you had a Mattermost account but have not logged in recently (since approximately 15 May), your account was migrated to P1 SSO and you will need to finish setting it up. Click here for instructions on how to finish migrating your account.

Mattermost Chat

If you are a new user to the platform:

Mattermost Exploit

If you need to set up a new account (i.e. you never had a Mattermost account), new Mattermost accounts are now created through P1 SSO. Click here for setup instructions.