diff --git a/ssl/check_openssl.sh b/ssl/check_openssl.sh
new file mode 100644
index 0000000..15a812c
--- /dev/null
+++ b/ssl/check_openssl.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+#
+# 20210816 petbau@linuxnet.ch / check proxy access for https
+#
+openssl s_client -proxy [proxy-ip-address]:9090 -connect fcm.googleapis.com -showcerts -CAfile /usr/local/share/ca
+-certificates/PROXYSUBCA.crt