If Slack is down globally, there is nothing to fix locally. Check the service status before spending time troubleshooting your device.
Close the app or refresh the browser tab. A simple relaunch can clear a temporary loading issue or stale session.
On desktop, clear browser cache or Slack app cache. Corrupted cached files commonly cause blank screens, missing messages, and login loops.
Allow notifications, microphone, and camera access. Also make sure Do Not Disturb or workspace mute settings are not hiding alerts.
If your workspace still will not load correctly, sign out completely and log back in to refresh the session.
Slack releases desktop and mobile updates every two to three weeks, often containing critical fixes for connection stability and notification delivery. On desktop, Slack checks for updates automatically at startup, but you can force a check by clicking Help → Check for Updates. On mobile, enable auto-update in your app store settings. Using Slack more than two versions behind can cause workspace sync failures and missing channel updates.
Slack's notification settings are highly granular and often misconfigured. Open Preferences → Notifications and confirm your Do Not Disturb schedule matches your actual working hours. Turn on notify me about replies to threads and direct messages separately. On mobile, check that Slack has permission to show notifications in your system settings. Many users disable notifications globally and then wonder why Slack stays quiet.
Being logged into multiple Slack workspaces simultaneously can cause authentication conflicts and notification routing problems. Remove any old or unused workspaces from your Slack sidebar by right-clicking the workspace name and selecting Sign Out. Stick to no more than three active workspaces in a single Slack instance. For additional workspaces, use Slack's Incognito window feature or a separate browser profile.
Before troubleshooting your device, visit status.slack.com to check if there is an active incident. Slack operates multiple data center regions, and your workspace may be on a different region than the app default. If Slack reports an API degradation or message delivery delay, no amount of local troubleshooting will help. Bookmark the status page and check it first whenever you experience widespread issues.
Slack's desktop app stores gigabytes of file previews, emoji, and channel history. A bloated cache causes slow channel switching and missed notifications. On desktop, click Help → Troubleshooting → Clear Cache and Restart. On mobile, go to Settings → Advanced → Reset Cache. After clearing, reload Slack and allow it to rebuild the cache fresh. This often fixes loading spinners that never resolve.
Corporate networks often route Slack traffic through proxies or custom DNS servers that can interfere with WebSocket connections. Slack relies on persistent WebSocket connections for real-time messaging. If your IT department uses a proxy, add *.slack.com and *.slack-edge.com to the bypass list. On personal networks, switch your DNS to Cloudflare (1.1.1.1) or Google (8.8.8.8) and flush your DNS cache before reopening Slack.
Message failures are usually caused by network issues, an outdated app, or a workspace connection problem.
Delayed notifications can be caused by Do Not Disturb settings, out-of-office status, or background data restrictions on mobile.
Sign-in problems often come from an incorrect workspace URL, a stale session, or single sign-on (SSO) configuration changes made by your IT admin.
Huddle and call issues usually stem from missing microphone or camera permissions, or network bandwidth limitations.
An endless loading screen usually means the desktop app cannot establish a WebSocket connection. First, check if Slack works in a browser. If it does, clear the desktop app cache and disable any third-party antivirus that might be inspecting SSL traffic. On macOS, go to System Settings → Privacy & Security → Screen Recording and ensure Slack is listed if you share your screen.
File upload failures can happen when the file exceeds Slack's size limit (1 GB for paid plans, much lower for free workspaces). Check the file size first. Also verify that your workspace has not reached its storage quota. If uploads fail on all files, clear your cache and check your network for firewall rules that block file transfer endpoints at files.slack.com.
Frequent sign-outs are typically caused by expired SSO sessions or workspace security policies enforced by your IT admin. If your organization enforces periodic re-authentication, this is normal. For personal workspaces, clear your cookies and cache, then reset your password. Two-factor authentication session tokens can also expire; re-verify your 2FA method to regain stable access.
Try the same service on a different device or network. If it works elsewhere, the issue is local to your device or network. If it fails everywhere, the service itself may be down - check Downdetector or the service's official status page to confirm.
Yes. A full restart (not just closing the app) clears stale connections, frees memory, and resolves the majority of intermittent glitches. Try this before deeper troubleshooting steps.
Open the App Store (iPhone) or Google Play Store (Android) and search for the app - if an Update button appears, tap it. On desktop apps, look for an About or Check for Updates option in the menu. Outdated apps often break after server-side updates.
If clearing the cache, updating, and restarting have all failed, reinstall the app as a last resort. A clean reinstall removes corrupted data, settings, and permissions that the standard fix steps cannot reach. Your account and saved data are stored in the cloud, so you won't lose anything by reinstalling.