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proj2005

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Windows nt 4.0 Server

I've installed a 10/100 3905b-tx on a nt40 server connected to a dedicated 10mb switch and
been running ok for the past decade.  I've been trying to establish a 100mb connectivity by
connecting this server to a cataylst 2900 10/100 switch. I am unable to ping this after
this new connection, did arp -a and its mac is that of my pix firewall which is also my gateway.
.Is Winnt 40 server not 100mb literate.?
Thanks in advance for any recommendations or ideas
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Lee W, MVP
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proj2005

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thanks for the quick response, wanted to add that i'm only sp5 because my netscape messaging server
was not qa'd or test beyond sp5.
I've done the following: 1. Tried a total two catalyst switches
 2. Swap cable from patch panel to the switch
3. Installed a 3905c nic
4. When trying to update the nic driver for 3905c, i got an error msge stating not a valid registry
    configuration or something.
5. I rolled back to the orig configuration and back to my 3com superstack switch which has 12 10mb ports so everyone can get their email tomorrow morning.

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vikasjus,
Thanks for the suggestions, cant do much till this evening/after hours.
more to come
Just dropping a line for an update. I'll be working on this Friday Eve or Sat morning.
I'll be using the ethercd ver 5.3 for 3c90x series. I would like to backup my registry prior
to updating, I've only done an export on the entire registry. I'll check if nt has system state data?
Thanks
My temp solution:
I finally went into the switch configuration in my 2950 switch and lowered the
speed to 10mb. At least its working properly on a faster switch. My corp IT
has gig e switches on their backplane and confirmed that they can lower its speed as well.
One thing I did not try and that is from vikasjus, which set to 100mb / half duplex which I'll try
this weeknd.
Thanks again to all
Sorry for the belated points, thank you both for your help