Connection refused

[DiarQoroviqi]

After implementing all the steps of Combining both in one docker setup , Initialising the server and Registration of local apps I got an error when connecting on docker ssh with command ./psh.phar docker:ssh and trying to install the app:
cURL error 7: Failed to connect to 0.0.0.0 port 7777: Connection refused (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for http://0.0.0.0:7777/registration?shop-id=nNFxay7wr1EWjGxG&shop-url=http://localhost:8000&timestamp=1627379465

Here is my manifest.xml file

pqtTrackingManager PAQATO Tracking Manager PAQATO Tracking Manager PAQATO – Sendungsverfolgung in Ihrem eigenen Online-Shop; automatisierte, individuelle und DSGVO konforme Versandbenachrichtigungen; Versandanalyse und proaktive Problemlösung; einheitlich für alle Paketdienstleister und Speditionen PAQATO - Track and trace in your own online shop; automated, individual and DSGVO conform track and trace notifications; shipping analysis and proactive problem solution; uniform for all shipping providers PAQATO GmbH (c) by PAQATO GmbH 1.0.0 MIT

<setup>
    <registrationUrl>http://0.0.0.0:7777/registration</registrationUrl> <!-- replace local url with real one -->
    <secret>143af21f36dda6b4bc40df8cb045616d</secret>
</setup>

<admin>
    <!-- replace local  urls with real ones -->
    <action-button action="addOrderList" entity="order" view="detail" url="http://localhost:7777/actionbutton/add/orderlist">
        <label>Add order list</label>
        <label lang="de-DE">Bestellliste hinzufügen</label>
    </action-button>

    <module name="orderList" source="http://localhost:7777/iframe/orderlist">
        <label>Order list</label>
        <label lang="de-DE">Bestellliste</label>
    </module>
</admin>

<permissions>
    <create>state_machine_history</create>
    <read>order</read>
    <update>order</update>
    <read>order_line_item</read>
    <read>state_machine_state</read>
</permissions>

<custom-fields>
    <custom-field-set>
        <name>swag_orderlist</name>
        <label>Order list</label>
        <related-entities>
            <order/>
        </related-entities>
        <fields>
            <text-area name="order-list">
                <position>1</position>
                <label>Order list</label>
                <label lang="de-DE">Bestellliste</label>
            </text-area>
        </fields>
    </custom-field-set>
</custom-fields>

<webhooks>
    <!-- replace local urls with real ones -->
    <webhook name="checkoutOrderPlaced" url="http://localhost:8000/hooks/order/placed" event="checkout.order.placed"/>
    <webhook name="appLifecycleDeleted" url="http://localhost:8000/applifecycle/deleted" event="app.deleted"/>
</webhooks>