Unable to call SOAP server: (-2147467259) Unspecified error

When you create a new domain or update an existing one in Plesk you receive the following error:

"Unable to call SOAP server: (-2147467259) Unspecified error"

This error will occur if you have SmarterMail installed on your server and its not properly configured, or (smwebmail) site is stopped in IIS.

SOLUTION:

1. Check to make sure that Plesk is configured properly to connect with SmarterMail
2. "smwebmail" site in IIS is not stopped
3. Be sure you have bind 9998 port with all assigned IPs in the webmail site if using IIS.