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ISA Server behind CheckPoint

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ISA Server behind CheckPoint - 1.Aug.2005 9:58:00 AM   
junior_jj

 

Posts: 15
Joined: 22.Nov.2002
From: Caribbean
Status: offline
Hi everybody,
I need some help to get working my installation of ISA Server 2004.
My deployment look like this
Internet
|
Checkpoint
|
ISA Server
|
Internal Network.

I'm trying to publish our Exchange Front End server but I can't get it work.
Please all help is welcome.

Thank you,
Junior.
Post #: 1
RE: ISA Server behind CheckPoint - 1.Aug.2005 10:37:00 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi Junior,

Are the connections making it to the ISA firewall, or stopping at the Check Point?

Thanks!
Tom

(in reply to junior_jj)
Post #: 2
RE: ISA Server behind CheckPoint - 1.Aug.2005 2:34:00 PM   
junior_jj

 

Posts: 15
Joined: 22.Nov.2002
From: Caribbean
Status: offline
Before anything we must describe you our network scenario.
Our ISA server has the gateway specified for both, the internal and the external NIC configuration.

That is because with have VLans and the internal NIC need the gateway to properly communicate with the internal hots.

The IP for the MX record is different from the IP of the Checkpoint and we're routing the SMTP traffic between the Internet and the internal equipments. We have a Static NAT in Checkpoint
capturing the traffic directed to the MX Record and redirecting it to the external ISA NIC IP.

Each time that we try a connection with a Telnet command to the port 25 we get the next error on the DOS Command :
"Connecting To mail.domain.com ... Could not open connection to the host, on port 25: Connect failed"

And on the log of the ISA server we get a dinied error message. We think that It means that the comunication stop at the ISA External NIC.

I suspect that the problem could be the SMTP Inbound Rule, but I'm so confused.

(in reply to junior_jj)
Post #: 3
RE: ISA Server behind CheckPoint - 2.Aug.2005 2:00:00 PM   
junior_jj

 

Posts: 15
Joined: 22.Nov.2002
From: Caribbean
Status: offline
Hi everybody,
Look like nobody wants to help me...
Does anybody have questions?

Please help me!
Junior.

(in reply to junior_jj)
Post #: 4
RE: ISA Server behind CheckPoint - 2.Aug.2005 4:22:00 PM   
junior_jj

 

Posts: 15
Joined: 22.Nov.2002
From: Caribbean
Status: offline
Hello everybody,
I only wants to know which configuratin is best for me....
Back to Back or Edge Firewall.
I need some help to determined this.

Thank you...
Junior

(in reply to junior_jj)
Post #: 5
RE: ISA Server behind CheckPoint - 3.Aug.2005 6:26:00 PM   
junior_jj

 

Posts: 15
Joined: 22.Nov.2002
From: Caribbean
Status: offline
Please.... I'm still waiting for some help.

(in reply to junior_jj)
Post #: 6
RE: ISA Server behind CheckPoint - 3.Aug.2005 9:08:00 PM   
citrixman

 

Posts: 17
Joined: 3.Mar.2005
Status: offline
hi I setup ISA 2004 behind Checkpoint firewall -1 NG a few months ago so our setups are nearly exactly the same.. If you have MSN send me a PM with your address and we can talk it over via MSN messenger its too difficult trying to troubleshoot this over a forum.

Citrixman [Smile]

(in reply to junior_jj)
Post #: 7
RE: ISA Server behind CheckPoint - 9.Aug.2005 4:06:00 PM   
junior_jj

 

Posts: 15
Joined: 22.Nov.2002
From: Caribbean
Status: offline
I did it, I'm just waiting on MSN Messenger.
Thank you citrixman!

(in reply to junior_jj)
Post #: 8
RE: ISA Server behind CheckPoint - 11.Aug.2005 11:08:00 AM   
junior_jj

 

Posts: 15
Joined: 22.Nov.2002
From: Caribbean
Status: offline
Hi citrixman,
Look I dunno if you received the PM that I sent to you, please let me know if this is true.

I'm waiting for that help.

Thank you...
Junior V.

(in reply to junior_jj)
Post #: 9
RE: ISA Server behind CheckPoint - 18.Oct.2005 4:58:00 PM   
phillipm

 

Posts: 23
Joined: 7.Jun.2004
From: Wellington, New Zealand
Status: offline
hey did you ever find a fix? let me know cause i am in the same boat ..

cheers
phil

(in reply to junior_jj)
Post #: 10

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