i am trying to implement this in my application to send a mail but i keep getting this error i configured in my web.config

<system.net>
        <mailSettings>
            <smtp from="dep-it@public-health.gov.lb" deliveryMethod="Network">
                <network host="mail.ogero.gov.lb" password="" userName="" port="25" defaultCredentials="true"/>
            </smtp>
        </mailSettings>
    </system.net>

and this is the code i'm using :

Public Function SendMail(ByVal strTo As String, ByVal strSubject As String, ByVal strMsg As String, ByVal path As String) As Boolean
        'ByVal strFrom As String,
        Try
            ' Create the mail message
            Dim objMailMsg As MailMessage = New MailMessage("dep-it@publichealth.gov.lb", strTo)
            objMailMsg.BodyEncoding = Encoding.UTF8
            objMailMsg.Subject = strSubject
            objMailMsg.Body = strMsg
            objMailMsg.Priority = MailPriority.High
            objMailMsg.IsBodyHtml = True
           

            'prepare to send mail via SMTP transport
            Dim objSMTPClient As SmtpClient = New SmtpClient()
            'objSMTPClient.EnableSsl = True
            objSMTPClient.Credentials = CredentialCache.DefaultNetworkCredentials
            objSMTPClient.UseDefaultCredentials = True
            objSMTPClient.DeliveryMethod = SmtpDeliveryMethod.Network
            objSMTPClient.Send(objMailMsg)
            Return True
        Catch ex As Exception
            Client_Alert(ex.ToString)
        End Try
    End Function

it keeps giving this error :

System.Net.Mail.SmtpException was caught
  Message="Failure sending mail."
  Source="System"
  StackTrace:
       at System.Net.Mail.SmtpClient.Send(MailMessage message)    at WebOracle.mails.SendMail(String strTo, String strSubject, String strMsg, String path) in C:\Documents and Settings\Administrator\My Documents\Visual Studio 2008\Projects\WebOracle\mails.aspx.vb:line 57
  InnerException: System.Net.WebException
       Message="Unable to connect to the remote server"
       Source="System"
       StackTrace:
            at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout)    at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback)    at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback)    at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout)    at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port)    at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port)    at System.Net.Mail.SmtpClient.GetConnection()    at System.Net.Mail.SmtpClient.Send(MailMessage message)
       InnerException: System.Net.Sockets.SocketException
            ErrorCode=10065
            Message="A socket operation was attempted to an unreachable host 205.177.180.20:25"
            NativeErrorCode=10065
            Source="System"
            StackTrace:
                 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)    at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)    at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)

Does anyone have ideas??