In order to get iNotes to work from IBM Connections 4.0 over HTTP, where SSL is not enabled on the Domino server (only accessible via HTTP).

IBM Connections Mail is configured correctly.

<ServerConfig name="dominoconfig" enabled="true">
    <ConfigType>DOMINO</ConfigType>
    <DirectoryServer>nts-r90.d-pit.local</DirectoryServer>
    <DirectoryUser>ldapconnections</DirectoryUser>
    <DirectoryPW>ldapconnections</DirectoryPW>
    <MailPattern type="d-pit.com"/>
</ServerConfig>

When logged into IBM Connections, neither Mail or Calendar details are displayed, and the error message is

Mail server cannot be reached

By utilising a HTTP Tracing Tool, we can see that a https connection to the mail server was attempted and failed.

Workaround

In order to resolve this issue, you may either:

Enable SSL on your IBM Domino mail server

or

Configure a fixed hostname in socialmail-discovery-config.xml using a http:// hostname

(where hostname equals the fully qualified domain name of the server being access e.g. http://nts-r90.d-pit.local)