I changed my ISP and I connected new adsl modem/router Well PTI-845. Everything was OK, internet on desktops and incoming mail was without problems. But I was not able to send mail out of my domain. I tried to send a post by telnet manually - it was ok. On remote SMTP server I noticed that in log there is a mistake in comunnication with my Exchange 2000 server - data time out. After several hours I tried to use another modem/router and Exchange sent all post immediately out. Later I connected Well modem/router again and changed MTU value but without success. Firewall was disabled. Have you any idea where is a mistake?
Edas wrote: > I changed my ISP and I connected new adsl modem/router Well PTI-845. > Everything was OK, internet on desktops and incoming mail was without > problems. But I was not able to send mail out of my domain. I tried > to send a post by telnet manually - it was ok. On remote SMTP server > I noticed that in log there is a mistake in comunnication with my > Exchange 2000 server - data time out. After several hours I tried to > use another modem/router and Exchange sent all post immediately out. > Later I connected Well modem/router again and changed MTU value but > without success. Firewall was disabled. Have you any idea where is a > mistake? If you are using the same ISP for the connection & it works fine with one modem and not with the other, I suggest you contact the hardware manufacturer for support. Note that when you change ISPs, you should only be changing out their own equipment (in this case, their provided DSL modem) - and you ought to have your own firewall/router appliance between that modem and your LAN. This means you won't have to change much at all if you change ISPs. ADSL is not ideal for a business network - but even so, the ISP's hardware shouldn't be doing NAT/filtering/anything at all; your own hardware should be controlling that. Not sure if this is relevant to your situation or not, though.
