diff --git a/ssl/ssl.h b/ssl/ssl.h
index be6d88e..57771cd 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -900,6 +900,18 @@ SSL_IMPORT int SSL_DataPending(PRFileDesc *fd);
 SSL_IMPORT SECStatus SSL_InvalidateSession(PRFileDesc *fd);
 
 /*
+** Cache the SSL session associated with fd, if it has not already been cached.
+*/
+SSL_IMPORT SECStatus SSL_CacheSession(PRFileDesc *fd);
+
+/*
+** Cache the SSL session associated with fd, if it has not already been cached.
+** This function may only be called when processing within a callback assigned
+** via SSL_HandshakeCallback
+*/
+SSL_IMPORT SECStatus SSL_CacheSessionUnlocked(PRFileDesc *fd);
+
+/*
 ** Return a SECItem containing the SSL session ID associated with the fd.
 */
 SSL_IMPORT SECItem *SSL_GetSessionID(PRFileDesc *fd);
diff --git a/ssl/ssl3con.c b/ssl/ssl3con.c
index c1f30a3..17c368e 100644
--- a/ssl/ssl3con.c
+++ b/ssl/ssl3con.c
@@ -11367,7 +11367,7 @@ ssl3_FinishHandshake(sslSocket * ss)
         ss->ssl3.hs.receivedNewSessionTicket = PR_FALSE;
     }
 
-    if (ss->ssl3.hs.cacheSID) {
+    if (ss->ssl3.hs.cacheSID && ss->sec.isServer) {
 	PORT_Assert(ss->sec.ci.sid->cached == never_cached);
 	(*ss->sec.cache)(ss->sec.ci.sid);
 	ss->ssl3.hs.cacheSID = PR_FALSE;
diff --git a/ssl/sslsecur.c b/ssl/sslsecur.c
index 5c6751a..00ab455 100644
--- a/ssl/sslsecur.c
+++ b/ssl/sslsecur.c
@@ -1467,6 +1467,49 @@ SSL_InvalidateSession(PRFileDesc *fd)
     return rv;
 }
 
+static void
+ssl3_CacheSessionUnlocked(sslSocket *ss)
+{
+    PORT_Assert(!ss->sec.isServer);
+
+    if (ss->ssl3.hs.cacheSID) {
+	ss->sec.cache(ss->sec.ci.sid);
+	ss->ssl3.hs.cacheSID = PR_FALSE;
+    }
+}
+
+SECStatus
+SSL_CacheSession(PRFileDesc *fd)
+{
+    sslSocket *   ss = ssl_FindSocket(fd);
+    SECStatus     rv = SECFailure;
+
+    if (ss) {
+	ssl_Get1stHandshakeLock(ss);
+	ssl_GetSSL3HandshakeLock(ss);
+
+	ssl3_CacheSessionUnlocked(ss);
+	rv = SECSuccess;
+
+	ssl_ReleaseSSL3HandshakeLock(ss);
+	ssl_Release1stHandshakeLock(ss);
+    }
+    return rv;
+}
+
+SECStatus
+SSL_CacheSessionUnlocked(PRFileDesc *fd)
+{
+    sslSocket *   ss = ssl_FindSocket(fd);
+    SECStatus     rv = SECFailure;
+
+    if (ss) {
+	ssl3_CacheSessionUnlocked(ss);
+	rv = SECSuccess;
+    }
+    return rv;
+}
+
 SECItem *
 SSL_GetSessionID(PRFileDesc *fd)
 {