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[admin@MikroTik] > /tool sniffer/quick 
failure: configuration flagged, check all router configuration for unauthorized changes and update device-mode
[admin@MikroTik] > /int l2tp-client/add connect-to=1.1.1.1 user=user
failure: configuration flagged, check all router configuration for unauthorized changes and update device-mode

To exit the the flagged state, you must perform the command "/system/device-mode/update flagged=no". The system will ask to either press a button, or issue a hard reboot (cut power physically or do a hard reboot of the virtual machine). 

Important! Although the system has disabled any malicious looking rules, which triggered the flagged state, it is crucial to inspect all of your configuration for other unknown things, before exiting the flagged state. If your system has been flagged, assume that your system has been compromised and do a full audit of all settings before re-enabling the system for use. After completing the audit, change all the system passwords and upgrade to the latest RouterOS version.