Update how-to-connect-downstream-device.md

Author: nimanch

articles/iot-edge/how-to-connect-downstream-device.md

@@ -210,7 +210,7 @@ Use this sample command on the downstream device to test that it can connect to
 openssl s_client -connect mygateway.contoso.com:8883 -CAfile <CERTDIR>/certs/azure-iot-test-only.root.ca.cert.pem -showcerts
 ```
 
-This command tests connections over MQTTS (port 8883). If you're using a different protocol, adjust the command as necessary for AMQPS (5671) or HTTPS (433)
+This command tests connections over MQTTS (port 8883). If you're using a different protocol, adjust the command as necessary for AMQPS (5671) or HTTPS (443)
 
 The output of this command may be long, including information about all the certificates in the chain. If your connection is successful, you'll see a line like `Verification: OK` or `Verify return code: 0 (ok)`.