This is possibly because the SVN service is not running under a user account that can acess Gemini.
Can you verify?

Hello

I have modified the SVN service account with exactly the same account of the gemini user using the Windows autentication

The error is also :

Error: Commit blocked by pre-commit hook (exit code -532459699) with output: 
Error:  
Error: Unhandled Exception: System.Xml.XmlException: The 'BR' start tag on line 6 does  
Error: not match the end tag of 'FONT'. Line 7, position 3. 
Error:    at System.Xml.XmlTextReaderImpl.Throw(Exception e) 
Error:    at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args) 
Error:    at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag) 
Error:    at System.Xml.XmlTextReaderImpl.ParseEndElement() 
Error:    at System.Xml.XmlTextReaderImpl.ParseElementContent() 
Error:    at System.Xml.XmlTextReaderImpl.Read() 
Error:    at System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace) 
Error:    at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc) 
Error: at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) 
Error:    at System.Xml.XmlDocument.Load(XmlReader reader) 
Error:    at System.Xml.XmlDocument.Load(Stream inStream) 
Error: at CounterSoft.Gemini.Commons.Rest.Serializer.ConvertToObject[T](Stream stream) 
Error: at CounterSoft.Gemini.WebServices.BaseService.GetObjectFromReponse[T](Stream stream) 
Error: at  
Error: CounterSoft.Gemini.WebServices.BaseService.ThrowResponseException(WebResponse response) 
Error: at CounterSoft.Gemini.WebServices.BaseService.ProcessResponse[T](String url,  
Error: Object obj, RequestType requestType) 
Error:    at CounterSoft.Gemini.WebServices.BaseService.WhoAmI() 
Error:    at CounterSoft.Gemini.SourceControl.SVN.Program.Main(String[] args) 

It seems like the connector is unable to connect to Gemini, this can be because of the URL or username / password.
Can you try to log on to Gemini on that server using the same account as SVN?

Yes i can connect to gemini with same user / password with windows autentication (no connection page)

I verified, i can connect with Internet Explorer but not with Gemini Desktop

Can you please try the desktop while running DebugView and post the output?

I have found the problem

On Internet Explorer Option, on Security Tab
I have modified the "Local Intranet" options

And select the "automatic logon with curent username and password" from "User Authentication" paragraph"

And now it works fine