DiServer "Could not load virtual interface"

I have set up a new test environment with SAP B1 9.1, but when try to login throug DiServer it returns fault

Request

<?xml version="1.0" encoding="UTF-16"?><env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"> <env:Body> <dis:Login xmlns:dis="http://www.sap.com/SBO/DIS"> <DatabaseServer>SAPSQL</DatabaseServer> <DatabaseName>MyDatabase</DatabaseName> <DatabaseType>dst_MSSQL2014</DatabaseType> <CompanyUsername>MyUser</CompanyUsername> <CompanyPassword>####</CompanyPassword> <Language>ln_English</Language> <LicenseServer>SAP:30000</LicenseServer> </dis:Login> </env:Body></env:Envelope>

Response (Fault)

<?xml version="1.0"?><env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope"><env:Body><env:Fault><env:Code><env:Value>env:Receiver</env:Value></env:Code><env:Reason><env:Text xml:lang="en">Could not load virtual interface</env:Text></env:Reason><env:Detail><Command>Login</Command></env:Detail></env:Fault></env:Body></env:Envelope>

I have found nothing in google with that Reason...

Could you give me some hint?

Thank you

Regards,