Error code 80131500 and message "Connection failed"

Hi, I am having trouble to connect to remote ftps server with .wsf scripts. But I can connect with WinSCP program and WS_FTP program. The error message is "connection failed" and the error code is 80131500. Here is code I am using:
<job>
<reference object="WinSCP.Session"/>
<script language="VBScript">

Option Explicit

' Setup session options
Dim sessionOptions
Set sessionOptions = WScript.CreateObject("WinSCP.SessionOptions")
With sessionOptions
.Protocol = Protocol_ftp
.ftpSecure = FtpSecure_Implicit
.PortNumber = 62000
.HostName = "xxxxx.xx.xxx"
.UserName = "xxxxxx"
.Password = "xxxxxxx"

End With

Dim session
Set session = WScript.CreateObject("WinSCP.Session")

' Connect
session.Open sessionOptions

Dim today, stamp, logdate
logdate = Now & VbCrLf
today = Date
stamp = Year(today)
If Month(today) < 10 Then
stamp = stamp & "0"
End If
stamp = stamp & Month(today)
if Day(today) - 1 < 10 Then
stamp = stamp & "0"
End If
stamp = stamp & Day(today)

Dim fileName, remotePath, localPath
fileName = stamp & "_DATA.csv"
remotePath = "/xxx/xx_xxx_" & fileName
localPath = "x:\xx\xxx\xxx\xxxxD_" & fileName

Dim fs, sftplog
Set fs = WScript.CreateObject("Scripting.FileSystemObject")
Set sftplog = fs.OpenTextFile("E:\xxx\xxx.log", 8, True) '1 = reading, 2 = writing new, 8 = appending


Dim download, remoteWriteTime, localWriteTime

If session.FileExists(remotePath) Then
If Not fs.FileExists(localPath) Then
sftplog.WriteLine logdate & " File " & remotePath & " exists, local backup " & localPath & " does not"
download = True
Else
remoteWriteTime = CDate(session.GetFileInfo(remotePath).LastWriteTime)
localWriteTime = fs.GetFile(localPath).DateLastModified

If remoteWriteTime > localWriteTime Then
sftplog.WriteLine _
logdate & " File " & remotePath & " as well as local backup " & localPath & " exist, " & _
"but remote file is newer (" & remoteWriteTime & ") than local backup (" & localWriteTime & ")"
download = True
Else
sftplog.WriteLine _
logdate & " File " & remotePath & " as well as local backup " & localPath & " already existed. "
sftplog.WriteLine " Remote file created on " & remoteWriteTime
sftplog.WriteLine " Local backup " & localWriteTime
download = False
End If
End If

If download Then
' Download the file and throw on any error
session.GetFiles(remotePath, localPath).Check()

sftplog.WriteLine logdate & " Download to backup done."
End If
Else
sftplog.WriteLine logdate & " File " & remotePath & " does not exist yet"
End If
sftplog.Close
' Disconnect, clean up
session.Dispose

</script>
</job>

Kindly help me to solve this problem.

Please attach a full session log file showing the problem (using the latest version of WinSCP).