LastPass may show an unknown error if the browser being used is not officially supported by LastPass. For instance, problems have been reported with browsers like Pale Moon where LastPass login breaks and shows an unknown error due to compatibility issues.
LastPass supports a limited set of browsers listed on their website.
When you get “An unknown error occurred” in LastPass, it’s vague, so you’ll need to try several troubleshooting steps. Here’s a methodical approach you can use. If you tell me your OS / browser / app version, I can narrow it further.
🔍 Possible Causes
Some common reasons this error shows up:
Connectivity / server issues
Outdated LastPass extension/app
Corrupted cache / cookies
Conflicting browser extensions
Proxy, firewall or network restrictions
Issues with LastPass’s backend / outages
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🛠 Troubleshooting Steps
Try them one by one. After each, check if the error is resolved.
| # | Step | What to Do |
|---|---|---|
| 1 | Check LastPass status / outages | Visit LastPass status page or check communities (Reddit, DownDetector) to see if others are reporting similar “unknown error” issues. If it’s a server-side issue, you might just have to wait. |
| 2 | Ensure stable internet connection | Switch networks (e.g. Wi-Fi → mobile data) to see if the issue persists. |
| 3 | Update LastPass / browser / app | Make sure your LastPass extension or app is the latest version, and your browser is up to date. |
| 4 | Clear browser cache & cookies | In your browser settings, clear cookies, site data, and cache. Then restart the browser and try again. |
| 5 | Disable other extensions | Temporarily disable all other extensions except LastPass. Some privacy blockers or security extensions can conflict. |
| 6 | Reinstall LastPass extension / app | Uninstall LastPass, then re-add / reinstall it. After reinstalling, log in fresh. |
| 7 | Check proxy / firewall / VPN | If you’re using a VPN, proxy, or restrictive firewall, disable it temporarily or allow LastPass’s domains through. |
| 8 | Try from a different browser / device | See if LastPass works elsewhere (e.g. mobile app, different browser). This helps isolate whether it’s local to one environment. |
| 9 | Inspect LastPass account settings (if you can still login) | Sometimes settings like “password iterations” (for CLI / advanced usage) or security settings may be misconfigured. For example, in the CLI version, one user fixed a similar “unknown” error by changing their iterations setting in account settings to exactly 100100. |
| 10 | Contact LastPass Support | If nothing works, submit a support ticket including: your OS, browser / app version, steps you’ve tried, and screenshots (if possible). |
If more details on the specific context (browser, device, app or extension version, authentication settings) are available, more tailored advice could be offered.
This summary is based on various user reports and official support guidance from LastPass and community forums.
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