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Re: [FW-1] Strange connectivity problem!
On Thu, Apr 25, 2002 at 04:49:54PM -0500, Mehta, Phoram wrote:
> Have any of you guys came a cross a situation like this?
>
> i have two networks connecting through nokia IP440 3.4.1 fcs10 with fw-1
> 4.1sp5 running on it. one network consists of windows 2000 pro PCs, xp pro
> PCs and a few win95 PCs. the other network consist of few win NT servers and
> couple 2000 servers(not advanced and without active directory).
>
> whenever somebody tries to copy a big file(>>1 MB) from the server to a PC
> or vice versa , they get a network connectivity error. on trying a couple
> more times, it works sometimes). this happens also if you are just exploring
> the directories on the mapped drive. this happens intermittently and only
> with 2000 servers. anything with NT servers works just fine.
>
> i know that the mtu size in NT and 2000 has changed from ~1460 to ~1500. and
> the netbios port 139 used for NT is not used for 2000 or Xp , instead it
> uses 445 smp.
>
> microsoft says, its a problem with the firewall or the switches in between.
You're on the right track - try lowering the MTU on
the Win2K box. Check anything intervening too.
alan
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