We have an Apache server (Apache 2.2.3 bundled with RHEL 5.1)
configured to act as a reverse proxy for OWA2007 which sits inside our
internal network.

Everything is working fine for the most part -- save for ActiveSync
from Palm Treo devices. These fail miserably. I've begun
troubleshooting this but am hoping someone out there may have some
insight they could share. I found several reference to something like
this via Google, but none of the mentioned fixes seemed to work.

Since everything is SSL'ized, I've taken a peek at the SSL stream with
Wireshark and its SSL decryption options (very slick). I can see that
the Treo sends an OPTIONS /Microsoft-Server-ActiveSync request which is
proxied along correctly to the IIS server, a resopnse comes back and is
transmitted back to the Treo.

Subsequently, the Treo sends a:

POST /Microsoft-Server-ActiveSync?Cmd=FolderSync&User=...

request. This request is never proxied along to the IIS server.
Eventually things time out and the Treo gives up. I see the following
in the error log:

proxy: error reading status line from remote server owaserver
proxy: Error reading from remote server returned by /Microsoft-Server-ActiveSync

I'll paste portions of my config file here with options I think are
relevant. I can post the whole thing later if needed:

AddDefaultCharset UTF-8
RequestHeader unset accept-encoding
# This is a suggested setting.
RequestHeader set Front-End-Https "On"
SSLProxyEngine on
ProxyRequests off
# This is the default setting. Don't require a valid certificate.
SSLProxyVerify none
# This will preserve the Host: field in the request instead of using the
# name in the ProxyPass line.
ProxyPreserveHost on
# Suggested setting.
CacheDisable *
RedirectMatch permanent ^/$ https://owaserver/exchange/
RedirectMatch permanent /owa$ https://owaserver/owa/

# Stuff added to troubleshoot ActiveSync
Header unset WWW-Authenticate
Header set WWW-Authenticate "Basic realm=\"owaserver\""

<Location /Microsoft-Server-ActiveSync>
  ProxyPass https://owaserver/Microsoft-Server-ActiveSync
  ProxyPassReverse https://owaserver/Microsoft-Server-ActiveSync
  SetEnv force-proxy-request-1.0 1
  SetEnv proxy-nokeepalive 1
</Location>

This config includes a few suggestions I found on the web for the
errors I was seeing. None seemed to help.

Obviously I should try without the Proxy in the middle -- I am working
on doing this, but it will likely take a day or two to get appropriate
ports and forwarding configured on our firewalls.

Anyone have any thoughts or suggestions? I am running with
mod_security, but have disabled it while testing this. SELinux is also
enabled on the server, but I have placed it in Permissive mode for the
time being as well.

TIA,
Ray

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