If the Service Gateway is unable to communicate with the Master Server, a temporary workaround can be implemented to convert the Service Gateway to a Standalone Receiver and then use the SIM File Forwarder connector to transfer the files to the Master server.

The instructions for creating a Standalone Receiver can be found on the Snow documentation portal at the following link: Create a Standalone Receiver instance (snowsoftware.com) 

This involves a simplification of the snowserver.config file. The information in the <Server> portion of the configuration file will be what is currently shown in your snowserver.config file. The difference is the outer tags.

Below is an example.  NOTE: the incoming folder path and baseaddress values will be specific to your organization.
<Configuration>
  <StandaloneReceiver>
    <Server>
      <IncomingFolder>D:\Incoming</IncomingFolder>
      <BaseAddress>http://MyStandaloneReceiver:8778</BaseAddress>
    </Server>
  </StandaloneReceiver>
</Configuration>

The next step is to install the Snow Integration Manager (SIM) File Forwarder connector on the gateway server.  If SIM is not already installed on the gateway server, the instructions can be found found on the Snow documentation portal at the following link:
https://docs.snowsoftware.com/snow-integration-manager/en/UUID-fef376e5-40ac-8ee9-d5b0-cb6ac27d7268.html

Make sure to install the Snow Inventory File Forwarded located under “Other” in available connector options.



Instructions for configuring the File Forwarder can be found at the following link:
https://docs.snowsoftware.com/snow-integration-manager/en/UUID-8acc5896-8693-e3eb-1996-55052cda9f90.html
This will enable inventory and discovery files to be sent from the standalone receiver (previously referred to as a Service Gateway) to the master server.