diff --git a/CHANGES b/CHANGES
index f59af95..0e4c1d1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -65,6 +65,10 @@ Testing:
 	UNIX_TO_FILE UNIX_TO_ORPHANED GOPEN_TO_DENIED GOPEN_TO_DIRECTORY
 	GOPEN_TO_ORPHANED 
 
+	On RHEL-9 and Ubuntu-22.04 there is SCTP support for development but
+	not in kernel. test.sh now detects this situation and reacts with
+	warnings.
+
 ####################### V 1.7.4.3:
 
 Corrections:
diff --git a/test.sh b/test.sh
index 91fb57e..56e82a1 100755
--- a/test.sh
+++ b/test.sh
@@ -2070,6 +2070,7 @@ runsudp6 () {
 runssctp4 () {
     runsip4 >/dev/null || { echo SCTP4; return 1; }
     $SOCAT -h |grep ' sctp4-' >/dev/null || return 1
+    $SOCAT /dev/null SCTP4-L:0,accept-timeout=0.001 2>/dev/null || return 1;
     return 0;
 }
 
@@ -2077,6 +2078,7 @@ runssctp4 () {
 runssctp6 () {
     runsip6 >/dev/null || { echo SCTP6; return 1; }
     $SOCAT -h |grep ' sctp6-' >/dev/null || return 1
+    $SOCAT /dev/null SCTP6-L:0,accept-timeout=0.001 2>/dev/null || return 1;
     return 0;
 }