Pre-Live Environment not responding

Hello experts,

I do have credentials for the Pre-Live Environment and below URL

URL for HTTPS POST:

https://prelive.litle.com/vap/communicator/online

I have validated and verified the XML which seems correct. When I request above URL to test transaction it does not respond to any message

I just end up with the timeout after few minutes.

<litleOnlineRequest version="9.9" xmlns="http://www.litle.com/schema" merchantId="ID">
    <authentication>
        <user>Username</user>
        <password>Password</password>
    </authentication>
    <authorization id="ididid" reportGroup="rtpGrp" customerId="12345">
        <orderId>1</orderId>
        <amount>1</amount>
        <orderSource>ecommerce</orderSource>
        <billToAddress>
            <name>Jane Doe</name>
            <addressLine1>20 Main Street</addressLine1>
            <city>San Jose</city>
            <state>CA</state>
            <zip>95032</zip>
            <country>USA</country>
            <email>jdoe@litle.com</email>
            <phone>978-551-0040</phone>
        </billToAddress>
        <card>
            <type>MC</type>
            <number>5454545454545454</number>
            <expDate>1112</expDate>
            <cardValidationNum>123</cardValidationNum>
        </card>
    </authorization>
</litleOnlineRequest>