Allowing SMTP connections going out.

[blubomber]

I am new to the Sonicwall devices. I have previously used Watchguard fireboxes. i am trying to enable the ability to use the command line utility "telnet" to connect to outside SMTP servers for testing purposes. I believe the sonicwall is preventing me from doing this. When i try something like, c:\> telnet mail.host.com 25, i immediatly get a message saying it cannot connect. i have done the same connection from out side our network with no problems.

Any help at allowing me to do this would be greatly appreciated. Thank you.

 

[joepc]

What sonic os are you using? You need to create a rule to allow smtp trafic through the WAN and redirect it to an IP on the LAN.

 

[gwinn7]

Also, you can gain further insight by utilizing the Diagnostics features. One of them in particular is "Packet Trace". This is a very nice tool that sniffs packets and can give clues as to what is wrong.

But, it will come down to properly configuring your Sonicwall Firewall Rules to allow this traffic.

Gary
gwinn7

 

[blubomber]

thank you for the replies.

SonicOS enhanced 3.1.0.14-49e. i have looked through the config and there is a rule there for smtp traffic. we do have an inhouse exchange server. Email goes in and out just fine. but i cant do telnet stuff or use smtpdiag for trouble shooting email deliveries. I have tried doing the tests from the server itself, but just cant connect.

can i add my workstation to the sonicwall that will allow smtp communications?

thanks.

 

[joepc]

Let me make sure I understand you correctly. You are inside your network (behind the sonicwall on the LAN) and you are trying to telnet on port 25 to an Outside IP/dns address on another mail server on the internet?

 

[blubomber]

yes, that is correct. although i am not 100% sure it is the sonicwall that is blocking me but i am unsure what else would be.

thank you.

 

[blubomber]

yes, that is correct. although i am not 100% sure it is the sonicwall that is blocking me but i am unsure what else would be.

thank you.

 

[blubomber]

yes, that is correct. although i am not 100% sure it is the sonicwall that is blocking me but i am unsure what else would be.

thank you.

 

[blubomber]

OOPS!! do know what i did. sorry for the extra posts.

 

[joepc]

Well be default you should be able to go out to the WAN from the LAN on any port. So if http, https, ftp, telnet, etc. work fine from the LAN to the WAN then chances are it won't be the sonicwall, however you might want to check your NAT polices. They can change outgoing ports.

You can also take a look at your logs, maybe one of the security services is picking something up???

If you really want to boil it down you could hook a pc or laptop directly to the internet and bypass the sonicwall.

 

[blubomber]

sorry for the delayed up-date but i found out that my antivirus program on my PC was blocking SMTP from going out. So once i disabled the realtime protection, i was able to do SMTP stuff.

Thanks again for the help.