@TomBrick Greetings! Are you trying to establish a connection from a VM on Azure? Can you add below logging and add the log file here.

On MacOS and Linux, the odbc.ini file will need to be used to set the logging parameters at the DSN level.

Linux: /opt/simba/spark/lib/64/

To set logging or any configuration at the driver level(would work across all the DSN/DSN-less connections that use the driver), create/edit the simba.sparkodbc.ini file and add the logging configurations under [Driver] section. 

[Driver]

ErrorMessagesPath=/opt/simba/spark/ErrorMessages/ 

LogLevel=6

LogFileSize=2097152000

LogPath=/tmp/debug