1. The log files are located in <Applications Manager Home>/logs directory. If the Logging level in Admin tab-> Logging -> is not 'Print all logs', then change it to 'Print all logs' and reproduce the issue once. Ignore this step if product GUI is not accessible.
2. To create support information file via command prompt with administrator permission, execute createSupportFile.bat or createSupportFile.sh (in case of Linux) file present under <Applications Manager Home>/bin directory. The support information file along with time stamp will be in <Applications Manager Home>/working/support directory.
3. If the Support Information file is less than 500 MB, upload it to ManageEngine Upload site. Do mention the issue and Ticket ID before uploading the file.