WSUS 3.0 clients not reporting in, updates not being distributed to clients

I have WSUS 3.0 installed on a Windows 2003 SP2 server.  This server hosts 5 other websites, of which Sharepoint is managing 4.  The server itself is registering event 13042 (Self-update is not working) in the Application log several times a day.  I get the following when I run the WSUS Client Diagnostic tool on the server itself and any other client on the network:

WSUS Client Diagnostics Tool

Checking Machine State
        Checking for admin rights to run tool . . . . . . . . . PASS
        Automatic Updates Service is running. . . . . . . . . . PASS
        Background Intelligent Transfer Service is running. . . PASS
        Wuaueng.dll version 7.0.6000.381. . . . . . . . . . . . PASS
                This version is WSUS 2.0

Checking AU Settings
        AU Option is 4: Scheduled Install . . . . . . . . . . . PASS
                Option is from Policy settings

Checking Proxy Configuration
        Checking for winhttp local machine Proxy settings . . . PASS
                Winhttp local machine access type
                        <Direct Connection>
                Winhttp local machine Proxy. . . . . . . . . .  NONE
                Winhttp local machine ProxyBypass. . . . . . .  NONE
        Checking User IE Proxy settings . . . . . . . . . . . . PASS
                User IE Proxy. . . . . . . . . . . . . . . . .  NONE
                User IE ProxyByPass. . . . . . . . . . . . . .  NONE
                User IE AutoConfig URL Proxy . . . . . . . . .  NONE
                User IE AutoDetect
                AutoDetect not in use

Checking Connection to WSUS/SUS Server
                WUServer = http://eagle
                WUStatusServer = http://eagle
        UseWuServer is enabled. . . . . . . . . . . . . . . . . PASS
                Client is pointed to SUS 1.0 Server
        Connection to server. . . . . . . . . . . . . . . . . . PASS

WinHttpDownloadFileToMemory(szURLDest, NULL, 0, NULL, NULL, NULL, &downloadBuffe
r) failed with hr=0x80190194

No Error description could be found

Press Enter to Complete
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The last status report date for my clients is all over the map with one client reporting in on 9/17, another on 9/13, another 9/14, but most others not reporting in since 9/4.

WSUS settings are being deployed through GPO as follows:

Policy Setting
Allow Automatic Updates immediate installation Enabled
Allow non-administrators to receive update notifications Enabled
Automatic Updates detection frequency Enabled
Check for updates at the following
interval (hours):  8
 
Policy Setting
Configure Automatic Updates Enabled
Configure automatic updating: 4 - Auto download and schedule the install
The following settings are only required
and applicable if 4 is selected.
Scheduled install day:  0 - Every day
Scheduled install time: 12:00
 
Policy Setting
No auto-restart for scheduled Automatic Updates installations Enabled
Specify intranet Microsoft update service location Enabled
Set the intranet update service for detecting updates: http://eagle
Set the intranet statistics server: http://eagle
(example: http://IntranetUpd01)
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I have scanned the expert exchange site for this issue and everything that has resolved other people's issues have not helped to resolve this issue on my network yet.

Any assistance is greatly appreciated!