However, if I tried with all options ( PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL ) of confluent.topic.security.protocol, I am not able to get the connector started, if the MSK bootstrap server is not compatible with confluent solace sink connector?
There is a 30 day trial you can use, but @sarwarbhuiyan’s point is that even if you like it you wouldn’t (IIUC) be able to licence it for use with MSK.
To your question though - can you share further details of the problem. What error are you getting with each configuration that you try?
Caused by: org.apache.kafka.common.KafkaException: Principal could not be determined from Subject, this may be a transient failure due to Kerberos re-login