We are attempting something similar, we need to connect to a DB2 database running on Zos using the Splunk DB Connect App. Are you able to make this database connection, so far it fails for us. The error we are getting is "An attempt was made to access a database, T3COMN, which was either not found or does not support transactions. ERRORCODE=-4499, SQLSTATE=08004"....There is no record of any connection attempt at the Zos level. I have opened a support case and was told this was not tested on Zos
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