I think the local director itself will respond to the ping if it has connectivity to atleast one of the real servers. But, when you use telnet, there will be a separate TCP connection betweeen the client and LD, and between the LD and real server. So if the real servers do not accept TCP connection for some reason, this might fail. Probably, you can try ping and telnet to the real servers directly and see what is happening. If that does not work, then the problem may not be with LD. You can also check whether there are any filters like access-lists between the source and destination that blocks telnet.
Thank you for your answer, but it's not the situation.
I can make telnet to real servers directly from the clients.
One of the real servers is a router, and I have made a "debug ip tcp packets" and I can see a packet with the ip address of the client trying to establish a connections to the router on port 23, but the connections is closed, I don't know why.
ip client: 172.29.14.12
ip_real_server:172.28.0.19 (it's the router)
debug ip tcp packet:
tcp0: R SYNRCVD 172.29.14.12:3382 172.28.0.19:23 seq 2292460683
OPTS 4 ACK 694291197 SYN WIN 4128
tcp0: I SYNRCVD 172.29.14.12:3382 172.28.0.19:23 seq 694291197
RST WIN 0
And with 'debug ip transactions"
TCP0: state was LISTEN -> SYNRCVD [23 -> 172.29.14.12(3410)]
TCP0: Connection to 172.29.14.12:3410, received MSS 1460, MSS is 516
TCP: sending SYN, seq 2544725774, ack 694543400
TCP0: Connection to 172.29.14.12:3410, advertising MSS 556
CP0: RST received, Closing connection
TCP0: state was SYNRCVD -> CLOSED [23 -> 172.29.14.12(3410)]
tcp0: T CLOSED 172.29.14.12:3410 172.28.0.19:23 early close
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