Apache won't connect to app server after ubuntu 9.10 upgrade

Hi,

   I have been running webware on an ubuntu/apache/mod_webkit stack for
several years now with no problems.  I upgraded to ubuntu 9.10 and now
apache cannot connect to the webkit app server.  I've done a good deal of
troubleshooting, but I'm stuck.  Here's what happens in my apache error log
when I browse to any URL handled by webkit:
*
[Sat Dec 05 19:14:16 2009] [error] Can not open socket connection to WebKit
AppServer
[Sat Dec 05 19:14:16 2009] [error] Couldn't connect to AppServer, attempt 10
of 10, sleeping 1 second(s)
[Sat Dec 05 19:14:17 2009] [error] timed out trying to connect to appserver
-- giving up.*



(There are 10 total connection attempts from apache/mod_webkit to the
adapter then it just gives up).  I get a 500 internal server error page from
apache in my browser.  Here's what I know:

The app server is up and running and listening on port 9000. I can telnet to
it and verify it's the actual app server (It rejects HTTP as is expected).

*root@mrpc:~# netstat -ntlp |grep 9000
tcp        0      0 0.0.0.0:9000            0.0.0.0:*
LISTEN      3659/python
root@mrpc:~# telnet localhost 9000
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET / HTTP/1.0

HTTP/1.0 505 HTTP Version Not Supported
Content-type: text/plain

Error: Invalid AppServer protocol.
Sorry, I don't speak HTTP. You must connect via an adapter.
Connection closed by foreign host. the WebKit Install Guide.*


Apache is listening on port 80 (although *it's tcp6. * I don't think that
matters though. Could that cause problems?)

*netstat -ntlp |grep 80
tcp6       0      0 :::80                   :::*
LISTEN      1871/apache2    *


Static files are coming through apache fine.  Apache is configured to
connect to the app server as follows:

*    <Location /app>
        WKServer localhost 9000
        SetHandler webkit-handler
    </Location>*

>From the AppServer side, I don't see any activity in Logs, ErrorMsgs, or
Sessions, indicating it never sees any connections.


I'm attaching a file with the output if I run AppServer by hand.  That all
looks correct to me.  My suspicion is there is some problem with the
networking between mod_webkit and the appserver, but I have no idea what
that might be.  Here are some more details on the software versions I am
running:
*
root@mrpc:~# uname -a
Linux mrpc 2.6.31-16-generic #52-Ubuntu SMP Thu Dec 3 22:07:16 UTC 2009
x86_64 GNU/Linux



root@mrpc:~# dpkg -l apache\*|grep ii
ii  apache2
2.2.12-1ubuntu2.1                          Apache HTTP Server metapackage
ii  apache2-mpm-prefork
2.2.12-1ubuntu2.1                          Apache HTTP Server - traditional
non-threade
ii  apache2-threaded-dev
2.2.12-1ubuntu2.1                          Apache development headers -
threaded MPM
ii  apache2-utils
2.2.12-1ubuntu2.1                          utility programs for webservers
ii  apache2.2-bin
2.2.12-1ubuntu2.1                          Apache HTTP Server common binary
files
ii  apache2.2-common
2.2.12-1ubuntu2.1                          Apache HTTP Server common files*

root@mrpc:~# python
Python 2.6.4 (r264:75706, Nov  2 2009, 14:44:17)
[GCC 4.4.1] on linux2


I searched the webware-discuss archives and this error is common, but
usually it's due to misconfiguration.  As I said, this stack has been
running fine for years, so unless I've made a silly oversight, I think the
basics are correct in terms of apache and app server configurations (both
port 9000, etc).

Thanks for any tips you might have for me.

Pete

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