72006: LiveSync connector failed to resume

A LiveSync MongoDB connector could not resume its change stream from where it left off. It stores a resume token to continue after a restart, and this arises when that stored position cannot be read back.

What you should do

Check the resume token the connector stored in the database, since it could not be read back in the expected form. If the token document is corrupt or malformed the connector cannot continue from where it left off, so contact Ably support if you can't resolve it.

Why it happens

The MongoDB connector stores a resume token so it can continue its change stream after a restart. This error arises when that stored token cannot be read back, for example because the token document is not in the expected format.

What you'll see

The error is reported with code 72006 and HTTP status 500. The message is of the form unable to resume change stream: <detail>.