I have seen this happen before with Netgear switches. They are supposed to auto negotiate the link type and speed. Supposedly they will auto detect straight, uplink, 10/100, etc., etc. But have seen them refuse to talk to each other when linked together. I have also seen Cisco hardware refuse to auto negotiate connections and drop packets like crazy, or not pass traffic at all. -----Original Message----- From: Exchange Mailing List [mailto:ExchangeMailingList@xxxxxxxxxx] Sent: Sunday, November 21, 2004 3:25 PM To: [ExchangeList] Subject: [exchangelist] RE: change from 10 mps to 100 mps http://www.MSExchange.org/ Very true, but it would however, still work at 10. HTH Steve -----Original Message----- From: Du, Tran D [mailto:du.tran.d@xxxxxxxxxxxxxxxxxx] Sent: Sunday, November 21, 2004 6:57 PM To: [ExchangeList] Subject: [exchangelist] RE: change from 10 mps to 100 mps http://www.MSExchange.org/ I think, the best way for your problem is go back to your old switch, if your old cable is cat 3 , checked your cable is cat3 or cat5, cat3 won't worked with switch 100mps. -----Original Message----- From: steve alcock [mailto:steve.alcock@xxxxxxxxxxxxxx] Sent: Saturday, November 20, 2004 4:06 AM To: [ExchangeList] Subject: [exchangelist] change from 10 mps to 100 mps http://www.MSExchange.org/ Hi all, This seems like a stupid question but here goes : In the lab I have setup a windows server 2003 inc exchange, and two workstations, at the time I used an old 24 port 10 meg switch and all works fine, yesterday I got hold of a new 8 port 100 switch and no matter how I try I cannot get them to communicate, even by pinging they cant see each other, so I assumed the 8 port to be faulty, today I purchased a new 8 port switch and still the network does not work. I have now tested both 8 port hubs on another test network and both switches work fine ........ scratching my head now, how come both switches work on another network but not the domain controlled win2003 server test network ???????? anone shd a light on this for me Steve Alcock Calder House Spring Lane Colne Lancs BB8 9BD www.calderglen.net phone : +44 (0) 1282 871717