Urgent problem with receiving ext internet mail and cannot telnet

[garty]

We had Exchange 5.5 sp3 on a NT4 sp6a box and proxy 2 running fine.

We uninstalled Proxy2, UPGRADED to Windows 2000 sp2 and then installed ISA2000. Exchange was left untouched.

The problem is that we can send internal mail to each other no problem and RECEIEVE Internet emails but cannot send external emails.

In other posts the suggestion is to TELNET to the ISP and send a manual email. However, we are unable to TELNET anything other than itself.

No IP address changes or ISP changes.

Any thoughts anyone? This is rather urgent as MD wants his external mail sent "yesterday".

Thanks in advance.

Garty

 

[Spirit]

Can you still connect to your router, ifso can you ping any external address's? Are you using a firewall, has your routing table changed.

Can you connect to the internet?

Is there any problems with your ISP? Have you checked your dial up number?

How have you configured Exchange is it Dial on demand?

If you have an internet connection use Outlook to connect to it and download messages manually then forward them (Do not delete them after download so when you are back up and running people will get the messages normally) this may buy some time with the MD. Your ISP will help you do this if you don't know how.

 

[garty]

>Can you still connect to your router, ifso can you ping any external address's? Are you using a firewall, has your routing table changed.
We do not have a router. We use an external ISDN modem to connect. Yes we can ping any address we like, but can not telnet anything other than itself. We are using ISA2000's inbuilt firewall. I do not think our routing table will have changed. How would I check this?

>Can you connect to the internet?
Yes we can connect to the internet fine and web browsing is no problem.

>Is there any problems with your ISP? Have you checked your dial up number?
No problems that we know of. We spoke to them on Friday and their end seemed to be fine. Dial up number works fine

>How have you configured Exchange is it Dial on demand?
Exchange is configured to dial up when messages queued (15min max). It uses the normal DUN settings that the internet does.

>If you have an internet connection use Outlook to connect to it and download messages manually then forward them (Do not delete them after download so when you are back up and running people will get the messages normally) this may buy some time with the MD. Your ISP will help you do this if you don't know how.
We can receive messages no problem. It is just the ones going out that cannot be sent.

Thanks

Garty

 

[Spirit]

Get in touch with you ISP, check your IP configuration. I had this problem when I got a new router (receiving but not sending) and it was trying to connect to the wrong IP address.

From command type Route Print this will be pretty fruitless if you don't know what it was before but it will help your ISP's support desk.

 

[garty]

Thanks Spirit for your help last week.

We still do not know what the problem was. We ended up rolling back to pre-upgrade state, leaving Exchange on the NT4 box and buying a new box to sit W2k + ISA2000 on (clean build). Everything went sweet and everything now working!

Must have been some legacy setting somewhere as we did not do anything differently in the new build!!

That's Microsoft for you!

Thanks again.

Garty