---
title: "Microsoft Exchange - Troubleshooting Error -3408 when backing up Exchange 2007 Mailboxes"
slug: "microsoft-exchange-troubleshooting-error-3408-when-backing-up-exchange-2007-mailboxes"
updated: 2023-11-07T22:31:29Z
published: 2023-11-07T22:32:19Z
canonical: "docs.retrospect.com/microsoft-exchange-troubleshooting-error-3408-when-backing-up-exchange-2007-mailboxes"
---

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# Microsoft Exchange - Troubleshooting Error -3408 when backing up Exchange 2007 Mailboxes

Microsoft Exchange and SQL

Depending on whether RPCRroxy is on the same server as the Mailbox role, there are two cases.

## Solution for case 1:

If you’re in a single-server configuration with the RPCProxy and Mailbox on the same machine, then the above does not work since the loopback interface still uses IPv6. In this case, you need to make the following changes in the

Comment out the line ":::1 localhost"

Add the following two lines:

## Solution for case 2:

If you’re in a multi-server scenario where the RPCProxy is not on the same server as the Mailbox, then you need to do the following:

Unselect IPv6 from the properties of your NIC (on the RPC-over-HTTP Proxy machine); that will force the RPC-over-HTTP Proxy to use IPv4 to talk to Exchange and everything will be fine. In most cases, this step suffices. If it does not, continue with steps 2 and 3.

Under the regkey

Reboot the machine.

Last Update: November 10, 2012