BIS is a technology from Blackberry that allows end users to connect to an Exchange server without a BES server.

The problem is that BES asserts a security policy on the devices, and BIS does not recognise this, or support remote wipe functionality, local encryption (etc.).

  • How do I block (and optionally detect) BIS connections from my server?

The IP addresses for blocking BIS service are listed here (updated 11/10/11)


Preventing these IPs from accessing the OWA servers will prevent end users from bypassing security policy via BIS.

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