Dynamics AX 2009 workflow error

I have faced several problem getting workflow to run in Ax 2009.
Here is check list of what to look when workflow doesn't work like a flow.

- Reinstall .net business connector.
- Check that the IIS website where workflow reside is running
- Check that app pool used by workflow website is running
- Check that app pool used by workflow has identity the same with domain user set as business connector proxy account in ax (Admin > Setup > security > System service account > Business connector proxy).
- Check that there are two bath job : workflow message processing and workflow due date expiration in the basic > inquiry > batch job. If they don't exist or have problem, delete and create again using workflow configuration wizard (Admin > setup ).
- Else ? Please add.