doc: clarify that SSPI and GSSAPI are interchangeable

Reported-by: [email protected]
Discussion: https://postgr.es/m/167846222574.1803490.15815104179136215862@wrigleys.postgresql.org

Backpatch-through: 11

diff --git a/doc/src/sgml/client-auth.sgml b/doc/src/sgml/client-auth.sgml
index fc26e834237f0f75b6ebb352c6b9d6c320ce5c2f..860bf0fcb8f1f32c30c9bf79e0c502be1996120a 100644 (file)
--- a/doc/src/sgml/client-auth.sgml
+++ b/doc/src/sgml/client-auth.sgml
@@ -1306,10 +1306,12 @@ omicron         bryanh                  guest1
     <literal>negotiate</literal> mode, which will use
     <productname>Kerberos</productname> when possible and automatically
     fall back to <productname>NTLM</productname> in other cases.
-    <productname>SSPI</productname> authentication only works when both
-    server and client are running <productname>Windows</productname>,
-    or, on non-Windows platforms, when <productname>GSSAPI</productname>
-    is available.
+    <productname>SSPI</productname> and <productname>GSSAPI</productname>
+    interoperate as clients and servers, e.g., an
+    <productname>SSPI</productname> client can authenticate to an
+    <productname>GSSAPI</productname> server.  It is recommended to use
+    <productname>SSPI</productname> on Windows clients and servers and
+    <productname>GSSAPI</productname> on non-Windows platforms.
    </para>
 
    <para>