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Re: Problem with some Microsoft Sites

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Etienne Pretorius pravi:
Just interisted,

Are you firewalling off ICMP fragmentation needed? A MTU change could indicate a MSS mismatch.

Kind Regards

Etienne Pretorius
Network Administrator
<http://www.kingsley.co.za>


No, I'm not. ICMP is passed through.

However - mystery solved and -big surprise- it was the ISP's fault after all.

They somehow managed to change the route for our customer's DMZ network so it was coming in through the (slower) backup PPPOE link instead of the main (fibre) link.

This may also explain why MTU change had some effect (although I'd expect it to effect more then just 'microsoft.com').

Today I managed to convince the customer it wasn't our (proxy's) fault and they picked up the phone, called the ISP and now was all back to normal.

 Thanks for listening, Danilo



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