LockDown Browser Error -105 on Mac (Server Configuration Fix)

Last updated 2026-05-01 · LDBypass Editorial

What error -105 means

Error -105 indicates the server returned a Dashboard configuration that LDB could not apply because of a specific configuration value (often a feature flag mismatch, e.g. Respondus Monitor enabled on the Dashboard but the LDB version installed doesn't support the requested Monitor version).

Mac-specific causes

• Outdated LDB version that doesn't support a Monitor feature your instructor enabled.
• Course-side Dashboard misconfiguration (instructor escalation required).
• Cached client config from a previous Dashboard state.

Fix 1 - Update LDB to the current version

If your LDB has been installed for >3 months, update to the current release. Launch your existing LDB; it auto-checks for updates on launch. Alternatively, uninstall (see uninstall cluster) and download fresh from your LMS - this guarantees the latest build.

The current production build at the time of writing is 2.1.5.01. Older builds (2.0.x, 2.1.4) are partially compatible with newer Dashboard configs and produce -105 in the mismatch cases.

Fix 2 - Clear cache + reinstall

rm -rf ~/Library/Application\ Support/LockDown\ Browser/
rm -rf ~/Library/Caches/com.respondus.lockdownbrowser/

Then reinstall from your LMS. If -105 still appears, the issue is server-side - escalate to your instructor.

Fix 3 - Contact instructor with full diagnostic

Provide LDB version, macOS version, time of failed launch, and whether classmates have the same issue. Your instructor or university IT opens a Respondus support ticket.

If none of these work

The remaining cases trace to your specific course's Respondus Dashboard configuration - your university IT or instructor needs to look at the server side. Contact them with: the exact error code, the LDB version (right-click LDB.app → Get Info), the macOS version (About This Mac), and the time of your launch attempt.