How to ping the router on the external network?

Hello, I have a strange issue happening in my TMG_FW.


I will first explain my structure to facilitate understanding.


Net_Internal (10.10.10.X) <--> TMG_FW (200.X.X.42) <--> (200.X.X.60) Switch <--> (200.X.X.41) Router <--> Internet



1 - The internal network (10.10.10.X), I ping the TMG_FW (200.X.X.42);

2 - The internal network or TMG_FW (200.X.X.42) I ping the switch (200.X.X.60);

3 - The internal network or TMG_FW (200.X.X.42) I ping internet address;

4 - But I can´t ping the Router (200.X.X.41)! The router has to accept icmp rule!




---->first response in the log

Initiated Connection TMG_FW 
Log type: Firewall service 
Status: The operation completed successfully.  
Rule: [System] Allow ICMP requests from Forefront TMG to selected servers 
Source: Local Host (AAA.AAA.AAA.42:8) 
Destination: Router (BBB.BBB.BBB.41) 
Protocol: PING 
 Additional information 
Number of bytes sent: 0 Number of bytes received: 0
Processing time: 0ms Original Client IP: AAA.AAA.AAA.242 



---->second response in the log

Denied Connection TMG_FW 
Log type: Firewall service 
Status: A packet was dropped because its destination IP address is unreachable.  
Rule: None - see Result Code 
Source: Local Host (AAA.AAA.AAA.42:2048) 
Destination: Router (BBB.BBB.BBB.41) 
Protocol: PING 
 Additional information 
Number of bytes sent: 0 Number of bytes received: 0
Processing time: 0ms Original Client IP: AAA.AAA.AAA.42 



...


----> 

Closed Connection TMG_FW 
Log type: Firewall service 
Status: A connection was gracefully closed in an orderly shutdown process with a three-way FIN-initiated handshake.  
Rule: [System] Allow ICMP requests from Forefront TMG to selected servers 
Source: Local Host (AAA.AAA.AAA.42:8) 
Destination: Router (BBB.BBB.BBB.41) 
Protocol: PING 
 Additional information 
Number of bytes sent: 240 Number of bytes received: 0
Processing time: 74990ms Original Client IP: AAA.AAA.AAA.42
 

I need to ping the router for connectivity test! What to do?