check_http with auth issue

[stan]

Hi,
We're having problems with Nagios3 (3.2.0) reporting 'HTTP WARNING HTTP/1.1 401 Unauthorized' for check_http queries to a several switched CDUs of the same type. All these CDUs have HTTP Server = enabled, Authentication= Basic. 

Running check_http from the command line returns an OK status:
/usr/lib/nagios/plugins/check_http -I ppcr23ps1 --authorization=user:passwd
HTTP OK HTTP/1.1 200 OK - 763 bytes in 0.267 seconds

check_http is reporting OK status for all the other devices we're checking from this Nagios3 server.

This Nagios3 server is an internal server in a distributed nagios configuration, and we have 1 identical CDU configured on the main nagios server outside the firewall (the external nagios is 3.1.0). The check_http on the Nagios 3.1.0 server (external) does not give the WARNING 401 Unauthorized message. It displays HTTP OK HTTP 1.1 200 OK. 

To verify that the CDU config was not the problem or the firmware version
wasn't the problem on the 2 new CDUs being configd for the internal server, we added the external CDU
(already reporting OK on nagios 3.1.0) to the Nagios3 configuration & did a check_http. Like the other 2 units, the command line reports HTTP OK but nagios displays the 401 warning.

We've run from the command line check_http -v and it's identical on both servers (everything is OK). 
However, the header on the devices that do not get the 401 warning start
with a Server: descrip and Connection: close before the Content-Type 

CDU:

STATUS: HTTP/1.1 200 OK
**** HEADER ****
Content-Type: text/html
(the rest of the header info follows)

All other devices:

STATUS: HTTP/1.1 200 OK
**** HEADER ****
Server: Embedded Web Server    (or whatever server description per device)
Connection: close
Content-Type: text/html
(the rest of the header info follows)

Any ideas why it works on 3.1.0 and not 3.2.0?
Thanks


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