LockDown Browser Error -106 on Mac - Configuration Issue Fix

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Error -106 belongs to the same Respondus "general configuration" band as -101 and -105. The Mac-side fix path is identical: clear cache, update LDB, reinstall, retry. If -106 persists after a clean reinstall on the latest LDB, the issue is in your university's Respondus Dashboard.

What error -106 means

Error -106 indicates a configuration value the Dashboard returned that LDB rejected. Closely related to -105; the specific subcode differs but the diagnostic ladder is the same.

Mac-specific causes

Fix 1 - Update LDB

Same as error -105. Reinstall from your LMS link to guarantee the current build.

Fix 2 - Clear cache + reinstall

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

Fix 3 - Escalate to instructor / university IT

Provide LDB version, macOS version, time of attempt, and classmates' status. Server-side Dashboard fix typically takes 2-24h after the support ticket is opened.

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.

Frequently asked questions

Is -106 different from -101 and -105?

In Respondus's grouping, all three are "general configuration errors" with subtle differences in the specific Dashboard value rejected. The diagnostic and fix paths are identical from the Mac side.

Should I try multiple cache-clears in a row?

No - one cache-clear + reinstall is enough. Repeated attempts log on Respondus servers and trigger anti-fraud heuristics that can block your account temporarily.