In order to make your issue reports as actionable as possible, please provide the following information, depending on the issue type.

Bug report

For bug reports, provide this information, please:

What Debezium connector do you use and what version?

2.6.1

What is the connector configuration?

snapshot.mode: no_data 

What is the captured database version and mode of depoyment?

(E.g. on-premises, with a specific cloud provider, etc.)

AWS - RDS

What behaviour do you expect?

Accept `no_data` as snapshot.mode

What behaviour do you see?

PUT /connectors/***/config        
returned 400 (Bad Request): Connector configuration is invalid and        
contains the following 1 error(s):
        The 'snapshot.mode' value is invalid: Value must be one of always,        
never, initial_only, initial, custom
        You can also find the above list of errors at the endpoint        
`/connector-plugins/{connectorType}/config/validate`

Do you see the same behaviour using the latest relesead Debezium version?

(Ideally, also verify with latest Alpha/Beta/CR version)

Running on 2.6.1

Do you have the connector logs, ideally from start till finish?

(You might be asked later to provide DEBUG/TRACE level log)

Not really