[X4U] Software Update-low level how does it work?

[DZ-Jay]

Hello:

	I had a somewhat similar problem with different 
network/application/operating system, and it boiled down to the MTU size 
being too large for some TCP/IP transactions.  Is the network traffic 
encapsulated in a VPN, or otherwise encrypted?  If so, you might need to 
lower the MTU.

	Don't know if this applies to your problem, though.

	dZ.

Russell McGaha wrote:
> Folks;
>     First, PLEASE excuse the x-post for those of you who get both lists.
>     Second, I've got some clients on a Government installation that are 
> having troubles getting Software Update to do it's stuff.  Their 
> networking department can 'see' packets going out to '17.250.248.95' 
> (resolves to swscan.apple.com), but a reply NEVER comes back, yet 
> anywhere EXCEPT on their network Software Update just 'does it's thing' 
> [I've left an update waiting on my powerbook, just to check things].
>     Does anyone know, what ports, protocols, etc. Software updates uses, 
> or just how it works?  Supposedly they are NOT blocking any ports or 
> going thru a proxy server that requires a username/password [the only 
> article I found at Apple that closely matches what's happening, 
> references this as a problem].
> 
> THANKS for ANY help;
> Russell
> 
> P.S. The error Software Update gives is "unable to connect to the 
> Internet, please check your network connection and try again"; all other 
> browsing works fine.
> 
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