Enables the client to use Server Name Indication (SNI) in the TLS handshake to identify the server name that it is trying to connect to.
| Client: | Optional |
| Server: | Optional |
| Valid in: | SAS invocation, configuration file |
| Categories: | Communications: Networking and Encryption |
| System Administration: Security | |
| Default: | By default, the TLS SNI extension is not sent as part of the TLS handshake. |
| Restrictions: | The SSL_USE_SNI environment variable is supported only on UNIX. |
| Windows always sends SNI to the web servers. Some web servers do not support SNI and fail to connect when the TLS SNI extension is present. | |
| Operating environment: | UNIX |
| Note: | When this environment variable is specified, the TLS SNI extension is sent to the web server. |
| See: | Defining Environment Variables in UNIX Environments in SAS Companion for UNIX Environments |
| Examples: | Export the environment variable on UNIX hosts for
the Bourne Shell : export SSL_USE_SNI=1 |
Set the environment variable on UNIX hosts for the
C Shell : SETENV SSL_USE_SNI |
|
Set the environment variable at SAS invocation for
UNIX hosts:sas -dms -set SSL_USE_SNI |
UNIX clients and servers now support TLS Server Name Indication (SNI). The client uses SNI in the first message of the TLS handshake (connection setup) to identify the server name that it is trying to connect to.
| Default | SNI is disabled by default on UNIX. To enable SNI, specify the SSL_USE_SNI environment variable. |