Apache is throwing NLS_LANG error when connecting via HTTPS using a DAD

Question

Our Apache server is throwing this error
[Wed May  6 11:53:52 2009] [alert] [client 69.246.251.48] [ecid: 223452213192,1] mod_plsql: Unable to issue alter session : alter session set nls_language= "AMERICAN" ""
every time we connect to the server using HTTPS (the connection is using DAD -- see below for the DAD configuration).
If we run the same connection using HTTP it works fine.
Anyone know why this would happen and how we can correct it?
DAD configuration:
<Location /plshes>
SetHandler pls_handler
Order allow,deny
Allow from All
AllowOverride None
PlsqlDatabaseUsername hes
PlsqlDatabasePassword @<password here>=
PlsqlDatabaseConnectString hpprd NetServiceNameFormat
PlsqlNLSLanguage AMERICAN_AMERICA_WE8ISO8859P1
PlsqlAuthenticationMode PerPackageOwa
PlsqlSessionStateManagement StatelessWithFastResetPackageState
PlsqlErrorStyle ModPlsqlStyle
PlsqlAlwaysDescribeProcedure Off
</Location>

Answer 1

@AMN -- I'm sort of in your camp in that I don't think I should have to remove that line (which I've not been able to test yet, by the way). It's possible removing the line might bypass the issue since the statement will never get issued in the first place, but I will know there is some sort of issue between HTTP and HTTPS that is throwing this error.
To answer your questions:
1. The portal database (IASDB) returns:
PARAMETER VALUE
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CHARACTERSET WE8ISO8859P1
2. What do you mean by "pls/hes"?
3b. Which type of OAS? Can you clarify this question? OAS 10g (which means IASDB is version 9i). We run Apache using Webcache. This OAS serves up a custom application written largely in Forms and PL/SQL. Hmmm, maybe that's not what you mean by this question , though...
3a. Explain our SSL configuration -- I'll try. I configfured this 4 to 5 years ago and haven't changed it at all other than to update the Oracle Wallet certificates every year or two. We have a single physical server that hosts our infrsastructure and mid-tier components and nothing more. As mentioned, Apache is our webserver and we run Oracle's Webcache. The twist in our configuration (and probably the source of this issue we are having is somewhere in this twist) is that we use one physical server and one Apache web server to serve up both HTTP and HTTPS using a virtual host within Apache and then we deifned multiple sites and origin servers with several redirects on various ports so we can handle SSL and non-SSL connections depending on whether they come to us externally (inTERnet) or internally (inTRAnet).
Webcache sites (hes2 is the server name):
Site Origin Server
hes2:7778 hes2:7779
www.OurWebSite.com:80 hes2:8000
hes2:80 hes2:7779
sso.OurWebSite.com:80 hes2:7777
www.OurWebSite.com:443 hes2:4444
Webcache origin servers:
hes2:7777 HTTP
hes2:7779 HTTP
hes2:8000 HTTP
www.OurWebSite.com:4444 HTTPS
Webcache listen ports:
443 HTTPS -- has Oracle wallet defined for it
7778 HTTP
80 HTTP
Navigating to http://www.OurWebSite.com will redirect to hes2:8000, which is our virtual server (configuration below). Navigating to https://www.OurWebSite.com will redirect to hes2:4444.
There is probably a little more I need to provide to answer the "SSL configuration" question, but I think that is enough for now as this is already a long response -- my apologies for that.
Virtual host configuration in httpd.conf:
<VirtualHost *:8000>
ServerName www.OurWebsiteName.com
ServerAdmin [email protected]
Port 80
DocumentRoot "/u01/app1/oracle/10gasm/Apache/Apache/htdocs"
RewriteEngine on
RewriteOptions inherit
RewriteCond %{HTTP_HOST}!^www\.OurWebSite\.com [NC]
RewriteRule ^/(.*) http://www.OurWebSite.com/$1 [L,R]
OssoIpCheck off
OssoConfigFile /u01/app1/oracle/10gasm/Apache/Apache/conf/osso/osso-www.conf
<Location /portal>
Order Deny,Allow
Deny from all
Allow from (list of allowed IP addresses)
</Location>
<Location /forms>
Order Deny,Allow
Deny from all
Allow from (list of allowed IP addresses)
</Location>
<Location /discoverer>
Order Deny,Allow
Deny from all
Allow from (list of allowed IP addresses)
</Location>
<Directory /u01/app1/oracle/10gasm/Apache/Apache/htdocs/docs>
Order Deny,Allow
Deny from all
Allow from (list of allowed IP addresses)
</Directory>
<Directory /u01/app1/oracle/10gasm/Apache/Apache/htdocs/images>
Order Deny,Allow
Deny from all
Allow from (list of allowed IP addresses)
</Directory>
<Directory /u01/app1/oracle/10gasm/Apache/Apache/htdocs/optiform>
Order Deny,Allow
Deny from all
Allow from (list of allowed IP addresses)
</Directory>
LogLevel error
ErrorLog "|/u01/app1/oracle/10gasm/Apache/Apache/logs/www_error_log 43200"
</VirtualHost>