When we connect the ASL router to our LAN without the firewall everything works fine

Question

We have connected 3 sites over SDSL VPN connections with Cisco routers 827. On 1 site we have also an ADSL Connection to the internet. All the sites are using the same ADSL connection to connect to the internet. Between the Network and the ADSL router there is an Office connect VPN firewall. When we want to send or recieve e-mails from the site with the ADSL router there is no problem. When we try to send or recieve e-mails from the other sites it isn't possible. Whe can made telnet connections to the pop3 server on port 110 and we can made telnet connections to the SMTP server on port 25 but we cannot send any command to the server. When we connect the ASL router to our LAN without the firewall everything works fine. What is the problem?

Answer

This question was answered on November 29, 2004. Much of the information contained herein may have changed since posting.

You need to open a few more ports for domain based functions like user authentication and file browsing Try opening up 137, 138 and 139 and these ports should be able to be a part of the VPN traffic It is obvious that the firewall is blocking services if you take it out of the picture and everything works.

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Author

Posted by Michael of Katharine Gibbs School - New York on November 29, 2004