Unable to send and or receive email through TMG 2010 into an Exchange 2003 FBA

Facts:

Exchange 2003 Mailbox server on Windows 2003 RII

Exchange 2003 FBA- on Windows 2003 RII -- gateway is TMG's internal leg 192.168.1.2

TMG 2010 on windows 2008 RII: two legs - one on same lan with Exchange servers: 192.168.1.2 and external leg 172.16.1.3 NATed to an external facing firewall to a public IP.

Issue:

AM able to Telnet from TMG into the internet smtp servers on port 25

Am able to telnet from TMG into the exchange FBA's IP and on port 25

CANNOT: Telnet from TMG on it's own external leg 172.16.1.3 25 neither can i reach the public ip from the internet

CANNOT: Telnet from the FBA to TMG's external IP on port 25

logs on TMG: while attemting to telnet TMG from the internet

Failed Connection Attempt	TMG Box 4/18/2011 2:02:00 PM
Log type: Firewall service
Status: No connection could be made because the target machine actively refused it.
Rule: [System] Allow SMTP traffic to the local host for mail protection and filtering
Source: External (41.x.x.x:39504)
Destination: Local Host (172.16.1.3:25)
Protocol: SMTP

 logs of TMG: from the FBA

 

Initiated Connection	TMG 4/18/2011 5:56:34 PM
Log type: Firewall service
Status: The operation completed successfully.
Rule: [System] Allow SMTP traffic to the local host for mail protection and filtering
Source: Internal (192.168.1.7:1802)
Destination: Local Host (172.16.1.3:25)
Protocol: SMTP   Then: <object id="{AA54A692-5AC6-4FCA-8DA1-18F1C67B75AC}" classid="CLSID:7B800019-6212-41DC-B208-520B501FBFB2" width="100%" height="100%" testkey="ISA_LIST_CONTROL_{41601c15-d9f2-4e54-9156-1f595d751fca}" data="data:application/x-oleobject;base64,GQCAexJi3EGyCFILUB+/sgEDAABdWwAATAwAAA==" name="IsaListView"> </object>       <object id="{FBDEC32D-461A-4575-9784-076F3C68EFD9}" style="display: block;" classid="CLSID:7B800019-6212-41DC-B208-520B501FBFB2" width="100%" height="100%" testkey="ISA_LIST_CONTROL_{8739D9AE-A25E-4210-951E-16CD61B9057B}" data="data:application/x-oleobject;base64,GQCAexJi3EGyCFILUB+/sgEDAADhWwAAWxcAAA==" name="IsaListView"> </object>   Closed Connection TMG 4/18/2011 5:56:34 PM Log type: Firewall service Status: A connection was abortively closed after one of the peers sent an RST packet. Rule: [System] Allow SMTP traffic to the local host for mail protection and filtering Source: Internal (192.168.1.7:1802) Destination: Local Host (172.16.1.3:25) Protocol: SMTP

 

 

 

Firewall policies done:

Outbound Rule: All smtp from FBA to external & Local host all users

Inbound Rule: allow smtp server from External to FBA

 

NO email policy/smtp routes configured for am not inteding to use any edge functionality on the TMG

i want to simply publish my FBA to send and receive email please.

 

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NguriJN

Source: http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/dbb97359-dbb6-4afb-9e60-32e1f1cd9489

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