If you receive the following error after you try to delete or create a domain from helm or Restore from HelmRestoreTool-

2009-09-10 10:24:33 Website.IWeb_RemoveHostHeader 0-2147467259: Unknown error while adding host header: A name contained an invalid character.
{0}
2009-09-10 10:24:33 CDomainAlias.DeleteEx 0-2147467259: Unknown error while adding host header: A name contained an invalid character.
{0}
2009-09-10 10:24:33 CDomain.DeleteDomainEx 0-2147467259: Unknown error while adding host header: A name contained an invalid character.
{0}

2009-09-10 10:40:14 Website.IWeb_RemoveHostHeader 0-2147467259: Unknown error while adding host header: A name contained an invalid character.
{0}
2009-09-10 10:40:14 CDomainAlias.DeleteEx 0-2147467259: Unknown error while adding host header: A name contained an invalid character.

{0}
2009-09-10 10:59:22 Website.IWeb_AddWebsite 0-2147467259: Unknown error while creating site: A name contained an invalid character.
{0}
2009-09-10 10:59:22 CWebsite.RepairWebsiteEx 0-2147467259: Unknown error while creating site: A name contained an invalid character.
{0}

Solution – In the remote server where the site is hosted please goto C:\Helm.config\ and delete IIS.xml file. Now try to delete the domain from helm you will be able to delete successfully.

“`*“`arun …