From 1ce6893fa898cec44909c34189aa2609a5039ebe Mon Sep 17 00:00:00 2001
From: Ainsley Pereira <marble@pebble.org.uk>
Date: Tue, 12 Sep 2017 21:06:58 +0100
Subject: [PATCH] Exception isn't thrown until we call serve_forever, so that
 must be in the try block

---
 cps/web.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cps/web.py b/cps/web.py
index a683dfe7..54ef5eaa 100755
--- a/cps/web.py
+++ b/cps/web.py
@@ -3048,6 +3048,9 @@ def start_gevent():
     global gevent_server
     try:
         gevent_server = WSGIServer(('', ub.config.config_port), app)
+        gevent_server.serve_forever()
     except socket.error:
+        app.logger.info('Unable to listen on \'\', trying on IPv4 only...')
         gevent_server = WSGIServer(('0.0.0.0', ub.config.config_port), app)
-    gevent_server.serve_forever()
+        gevent_server.serve_forever()
+