When starting with DNG and document generation or when deploying new reports on the server the RRDG log is an invaluable resource for troubleshooting problems on the RRDG server. As expected the log provides detailed information on errors and additional information including performance data.
All the DNG logs can be access at https://server:9443/rm/logs. The log for document generation is rrdg.log which is located towards the end of the list.
By default the RRDG log is set on WARN level which means only warnings and errors will be logged. This is the recommended setting for most production servers but if you need to troubleshoot document generation you should increase the level and set it to INFO.
Changing the log level is done in the logger configuration page https://server:9443/rm/logs/config by setting the INFO/DEBUG level to the com.ibm.rational.rrdg logger