
94 CHAPTER 6: SYSTEM CONFIGURATION
License Agreements Click the specified button to view the license agreements for the 3Com
Email Firewall, the Anti-Virus software, and Third Party Open Source
products.
License Renewal or
Upgrade
To renew or upgrade your license, you will need an annual subscription
renewal key or an additional user key. You can obtain a key by contacting
your 3Com reseller, or you can visit
www.3com.com.
When you have obtained a renewal or upgrade key, return to this screen
and enter the key in the
New License Key
field and click License.
SSL Certificates A valid SSL certificate is required to support the encryption services
available on the 3Com Email Firewall. The SSL encrypted channel from
the server to the web browser (such as when using a URL that begins
with
https
), requires a valid digital certificate. You can use self-signed
certificates generated by the 3Com Email Firewall, or import certificates
purchased from commercial Certificate Authorities (CA) such as Verisign.
The disadvantage of self-signed certificates is that web browsers will
display warnings that the "company" (in this case, the 3Com Email
Firewall) issuing the certificate is untrusted. When you purchase a
commercial certificate, the browser will recognize the company that
signed the certificate and will not generate the warning messages.
A web server digital certificate can only contain one domain name, such
as
server.example.com
, and a limitation in the SSL protocol only allows
one certificate per IP address. Some web browsers will display a warning
message when trying to connect to any domain on the server that has a
different domain name than the server specified in the single certificate.
Digital certificates eventually expire and are no longer valid after a certain
period of time, and need to be renewed before the expiry date.
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