SourceOne Email Management: Outlook connection fails for RPC/HTTP in mixed mode environment.

Summary: SourceOne Email Management: Outlook connection fails for RPC/HTTP in mixed mode environment.

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Symptoms



When attempting to configure RPC over HTTP, unable to do so.

The environment is Mixed Microsoft Exchange (2010 and 2016).

Have already followed the KB article 498673: SourceOne Email Management: Message: You are unable to connect to a Microsoft Exchange 2016 Journal mailbox in a mixed Microsoft Exchange (2010 and 2016) environment which explains prerequisite for mixed mode and also KB article 492309: SourceOne Email Management: SourceOne account ca not access end users mailboxes while running activities. which uses RPC/HTTP protocol instead of MAPI/HTTP protocol when connecting the Outlook SourceOne profile with the Exchange server.

After following these two KBs, the user is unable to use the RPC/ HTTP connection to exchange and the SourceOne jobs still fail showing an established connections using only HTTP instead of the required RPC.

Cause

This  issue is caused by a parameter setting on the Exchange server side blocking RPC over HTTP on all mailboxes.

MAPIBlockOutlookRpcHttp: True

Resolution

The following flag is set to block RPC over HTTP on all the exchange mailboxes.

MAPIBlockOutlookRpcHttp: True

Changing this flag to false resolves the issue after re starting Outlook. Consult exchange documentation in order to change this value if unsure.

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Affected Products

SourceOne Email Management

Products

SourceOne, SourceOne Email Management
Article Properties
Article Number: 000082043
Article Type: Solution
Last Modified: 02 Jun 2025
Version:  4
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