Could you check with MySQL version? We tested it run well on MySQL and we don't support other databases at this moment. 

The new MyCollab release supports the bulk invitation. You can check it out

This message log is not the latest.

 Could you open the console window, go to %MYCOLLAB_HOME/bin, then run the startup.bat script, or send the entire mycollab.out to my email hainguyen@mycollab.com

Could you give me the log message display in the console of the bat file or in the %MYCOLLAB_HOME%/logs folder?

Hum, it's strange! From the error log, I can not reproduce the issue. By the way, let see if it happens in the new MyCollab release.

What is the java version you are using?

Hope that helps https://docs.mycollab.com/administration/email-configuration/

If you configure email but not sending the email, you can give me the error message in the log file. Most of the error causes should be logged there.

Hi,

See the log

17:35:09,718 INFO c.m.s.DefaultServerRunner:59 - Started DefaultServerRunner in 17.778 seconds (JVM running for 19.342)
17:46:35,483 WARN c.z.h.p.HikariPool:766 - HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=8m59s150ms).
17:50:28,405 INFO o.q.c.QuartzScheduler:585 - Scheduler MYCOLLAB_SCHEDULER_$_NON_CLUSTERED paused.

You see the time in your server log is strange, you started the server at 17:35 it connect successfully, you don't do anything then 17:46:35 the app said Thread starvation or clock leap detected (it is normal, not the error), then 17:50:28,405 it disconnect the database. So check again your workflow.

17:34:53,104 INFO c.m.s.DefaultServerRunner:50 - Starting DefaultServerRunner on q2256s-MacBook-Pro.local with PID 11519 (/Users/hainguyen/Projects/mycollab/mycollab2/mycollab-server-runner/target/classes started by hainguyen in /Users/hainguyen/Projects/mycollab/mycollab2/mycollab-app-community/src/main)

In addition, is it the initial message in your log?

Could you give me the log message in %MYCOLLAB_HOME%/logs?

Here you go https://docs.mycollab.com/getting-started/installation/ . Do you receive the email that gives you a couple of useful links?

For your issue, it seems you try to connect MyCollab to the remote database (the database on the different machine than MyCollab). To do this, you need to create a user that has the permission to connect to remote MySQL instance. This link may help you https://support.rackspace.com/how-to/mysql-connect-to-your-database-remotely/.