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 82bfd25fd1041ff828c6eaa8ab99da8cba07f878..73e3b39e8b4f0ba627e58a8fee5be83416b6da93 100644 (file)
--- a/doc/src/sgml/client-auth.sgml
+++ b/doc/src/sgml/client-auth.sgml
@@ -1505,10 +1505,12 @@ omicron         bryanh                  guest1
     negotiate mode, which will use
     Kerberos when possible and automatically
     fall back to NTLM in other cases.
-    SSPI authentication only works when both
-    server and client are running Windows,
-    or, on non-Windows platforms, when GSSAPI
-    is available.
+    SSPI and GSSAPI
+    interoperate as clients and servers, e.g., an
+    SSPI client can authenticate to an
+    GSSAPI server.  It is recommended to use
+    SSPI on Windows clients and servers and
+    GSSAPI on non-Windows platforms.