Cisco Cisco IronPort Encryption Appliance

For information about which operating systems are supported for release 4.5, see the 

For information about which certificate authorities are supported for release 4.5, see the 

Cisco Registered Envelope Service Open Source Documentation

For the best support experience possible, Cisco recommend that CRES recipients first check the FAQ 
page to find answers to commonly asked questions. If the issue cannot be resolved, Cisco recommends 
using Instant Messenger support or sending an email to the CRES support team (see the contact 
information below). For urgent issues, CRES recipients should contact CRES support at 
support@res.cisco.com. Cisco recommends using the following steps to resolve support cases:

First, use the ‘Frequently Asked Questions’ webpage—most issues with registration and envelope 
opening can be quickly resolved by seeing if your question is answered on the following webpage:

Between the hours of 6am and 6pm Pacific Time, CRES recipients can also obtain support via Instant 
Messenger by accessing the Instant Messenger Chat link available at:

Lastly, contact CRES Recipient Support via email—any issue that is not resolved by the CRES FAQ 
page should be emailed to CRES support (support@res.cisco.com). A recipient should expect to receive 
a response within 24 business hours of submitting his or her email.