need help in ssh client: key exchange

[foo foo]

Hello,

I have a problem with ssh client.
I have:

SSH-2.0-OpenSSH_2.3.1p1

When I try to connect to a sshd server (USING V2):
Remote protocol version 1.99, remote software version
OpenSSH_2.5.2p2

or

Remote protocol version 2.0, remote software version
OpenSSH_3.0.1p1


I get error (looking at codebase):

In sshconnect2.c:

        ssh_dhgex_client(kex, host, hostaddr,
client_kexinit,
                 server_kexinit);


    if (key_verify(server_host_key, (u_char
*)signature, slen, hash, 20) != 1){
        fatal("key_verify failed for
server_host_key");
        exit(-109);
    }


I see:
(gdb) p key->type
$1 = 1

which would mean: KEY_RSA.

Can someone please let me know: why in
file key.c:
    case KEY_RSA:
        return ssh_rsa_verify(key, signature,
signaturelen, data, datalen);
        break;

when would  routine:

ssh_rsa_verify(..) fail and why ?

I am trying to do password based authentication
on V2. Is it mandatory that v2 used only RSA based
authentication ?

Any help/info is appreciated.

Thank you,





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