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20.6.2.1 Name-Based Virtual Hosts and SSL
By default it is not possible to run multiple SSL-enabled virtual hosts on a server with
only one IP address. Name-based virtual hosting requires that Apache knows which
server name has been requested. The problem with SSL connections is, that such a re-
quest can only be read after the SSL connection has already been established (by using
the default virtual host). As a result, users will receive a warning message stating that
the certicate does not match the server name.
openSUSE comes with an extension to the SSL protocol called Server Name Indication
(SNI) addresses this issue by sending the name of the virtual domain as part of the SSL
negotiation. This enables the server to “switch” to the correct virtual domain early and
present the browser the correct certicate.
SNI is enabled by default on openSUSE. In order to enable Name-Based Virtual Hosts
for SSL, congure the server as described in Section “Name-Based Virtual
Hosts” (page 366) (note that you need to use port 443 rather than port 80 with SSL).
IMPORTANT: SNI Browser Support
SNI must also be supported on the client side. Although SNI is supported by
most browsers, some browsers for mobile hardware as well as Internet Explorer
and Safari on Windows* XP lack SNI support. See http://en.wikipedia
.org/wiki/Server_Name_Indication for details.
Congure how to handle non-SNI capable browser with the directive
SSLStrictSNIVHostCheck. When set to on in the server conguration,
non-SNI capable browser will be rejected for all virtual hosts. When set to on
within a VirtualHost directive, access to this particular Host will be rejected.
When set to off in the server conguration, the server will behave as if not
having SNI support. SSL requests will be handled by the rst Virtual host dened
(for port 443).
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