putty failed with "Server unexpectedly closed network connection" when using rsa

[user123456789]

Hi.

I need to connect from win to linux. Linux version is Fedora 7 and it runs on VirtualBox.

Now, if I connect with putty as usual, everything just works. But if I connect with public/private key pair, the connection crashes.

This is what putty says:

2009-04-02 04:16:57	Looking up host "192.168.178.33"
2009-04-02 04:16:57	Connecting to 192.168.178.33 port 22
2009-04-02 04:16:57	Server version: SSH-1.99-OpenSSH_4.5
2009-04-02 04:16:57	We claim version: SSH-2.0-PuTTY_Release_0.60
2009-04-02 04:16:57	Using SSH protocol version 2
2009-04-02 04:16:57	Doing Diffie-Hellman group exchange
2009-04-02 04:16:57	Doing Diffie-Hellman key exchange with hash SHA-256
2009-04-02 04:16:58	Host key fingerprint is:
2009-04-02 04:16:58	ssh-rsa 2048 27:94:e8:72:40:c0:5c:fc:7e:ed:72:a4:e1:7d:6b:21
2009-04-02 04:16:58	Initialised AES-256 SDCTR client->server encryption
2009-04-02 04:16:58	Initialised HMAC-SHA1 client->server MAC algorithm
2009-04-02 04:16:58	Initialised AES-256 SDCTR server->client encryption
2009-04-02 04:16:58	Initialised HMAC-SHA1 server->client MAC algorithm
2009-04-02 04:16:58	Reading private key file "E:\Putty\keys\key_priv.ppk"
2009-04-02 04:16:59	Offered public key
2009-04-02 04:16:59	Server unexpectedly closed network connection

What is strange here is that it says

ssh-rsa 2048 27:94:e8:72:40:c0:5c:fc:7e:ed:72:a4:e1:7d:6b:21

But I just generated a 1024 key!??!

There are various tutorials explaining how to do it, but as simple as it sounds, it just dosnt work.

This is what I did:

1. Generate RSA-Key
2. copy public key to ~/.ssh/authorized_keys
2.1 also tried authorized_keys2
3. Set private key file in putty

4. Connect

5. typed user name,

6. Error Message occured. So it doesnt promts me for key passphrase!

7. Looked for ./var/log/auth.log, but wasnt there

What could I do?
I just spend hours again trying to solve this problem!!

Up to now, I have no more information.

Thanks

[user123456789]

Hi.

Solved the problem partially.

I used ssh2 but the connection assumed ssh1.
So I generated an ssh1 key pair, set ssh1 in putty configuration, and bam, it
seems to work.

Now it promts me for passphrase and use pwd.

Back to the problem:
/etc/ssh/sshd_config says

authorized_keys

instead of

authorized_keys2

which should be the one for ssh2.

So the next question arises, how do I activate ssh2?

thanks

[user123456789]

More News.

Now this is out of my abilities.

I also have a fedora 9 on Suns VirtualBox.
Now I tried to connect there with ssh2 and rsa ssh2 and so on, and it just works without trouble. Also puttys pageant just worked right away.

On Fedora 7 ssh1 worked, but pageant doeant!

Now I could just use Fedora 9 or somebody may give me some hints what i have to tweek.

I looked in both, fedora 9's and 7's /etc/ssh/sshd_config file, but they just look the same.

Thanks

P.S.
Many site state that the public key should be put in authorized_keys2 but on Fedora 9 it just works with the authorized_keys file. Which is also the file mentioned in sshd_config