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Level 2

Assuming you have a hybrid architecture. In general to activate Litmus with Marketing instance following steps are required 

1 - Install the Inbox rendering package/deiiverability via Tools>Advanced>Import a package

2 - Configure an external account (HTTP Type )
Label - Deliverability server info
Internal name - deliverabilityInstance
Server: Server name
Encryption - None
Enabled = Checked

3 - Edit serverConf.xml.

To edit serverConf.xml to allow a call to the Litmus Server under urlPermission. This is how it looks in serverConf.xml from a working environment

<url dnsSuffix="deliverability.neolane.net" urlRegEx="https://deliverability\.neolane\.net/jssp/dm/renderingSeed\.jssp"/>
<url dnsSuffix="deliverability.neolane.net" urlRegEx="https://deliverability\.neolane\.net/nl/jsp/soaprouter\.jsp"/>

<url dnsSuffix="deliverability.neolane.net" urlRegEx="https://.*"/>
<url dnsSuffix="deliverability-app.neolane.net" urlRegEx="https://.*"/>

4 - Restart the services or Reload the config file using nlserver config -reload

5 - Check network related settings -
whether any proxy servers have been configured or
Port 80/443 opened on the Firewall for the App servers