rb: retry ports unavailable by EADDRNOTAVAIL

This situation might occur when we exhaust the temporary port range on
a machine with many TCP connections. It takes some time for the
temporary sockets to be returned to the reusable pool, and in that
short timespan there may be race conditions.

Signed-off-by: Andreas Tolfsen <ato@mozilla.com>

rb/lib/selenium/webdriver/remote/http/default.rb

@@ -32,10 +32,10 @@ def http
           MAX_RETRIES = 3
 
           def request(verb, url, headers, payload, redirects = 0)
-            request = new_request_for(verb, url, headers, payload)
-
             retries = 0
+
             begin
+              request = new_request_for(verb, url, headers, payload)
               response = response_for(request)
             rescue Errno::ECONNABORTED, Errno::ECONNRESET, Errno::EADDRINUSE
               # a retry is sometimes needed on Windows XP where we may quickly
@@ -46,11 +46,16 @@ def request(verb, url, headers, payload, redirects = 0)
               #
               # http://msdn.microsoft.com/en-us/library/aa560610%28v=bts.20%29.aspx
               raise if retries >= MAX_RETRIES
-
-              request = new_request_for(verb, url, headers, payload)
               retries += 1
 
               retry
+            rescue Errno::EADDRNOTAVAIL => ex
+              # a retry is sometimes needed when the port becomes temporarily unavailable
+              raise if retries >= MAX_RETRIES
+              retries += 1
+              sleep 2
+              retry
+
             rescue Errno::ECONNREFUSED => ex
               if use_proxy?
                 raise ex.class, "using proxy: #{proxy.http}"