Error Description : IDispatch error #3592

Error Description : IDispatch error #3592

 
I had 2 issue with the free version of Manage Engine ( Windows Health Moniroting )
 
1) cannot add machines the below error generated when try to add
 
Failed to connect: mailserver.sejeltech.com.
Error Code : -2147217400.
Error Description : IDispatch error #3592

 
2) few machines added but gray out ,no way to remove or re-add  ?
 
any idea ?
 
Thanks
Syed