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Sftp - Couldn't read packet: Connection reset by peer


 
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# 1  
Old 06-26-2014
Sftp - Couldn't read packet: Connection reset by peer

Hello to all,

i have a problem when trying to estabilish a sftp connection.

i setup a sftp server (i used feeFTPd) and i'm now trying to connect from two different machines.

from the first one everything is fine:

Code:
[user@machine1 ~]$ sftp -vvv user@xxx.xxx.xxx.xxx
Connecting to xxx.xxx.xxx.xxx...
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to xxx.xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/id_rsa type -1
debug1: identity file /home/user/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version WeOnlyDo-wodFTPD 3.2.2.395
debug1: no match: WeOnlyDo-wodFTPD 3.2.2.395
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug3: Wrote 792 bytes for a total of 813
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1
debug2: kex_parse_kexinit: ssh-rsa
debug2: kex_parse_kexinit: aes128-cbc,aes128-ctr,3des-cbc,blowfish-cbc,aes192-cbc,aes192-ctr,aes256-cbc,aes256-ctr,rijndael128-cbc,rijndael192-cbc,rijndael256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-cbc,aes128-ctr,3des-cbc,blowfish-cbc,aes192-cbc,aes192-ctr,aes256-cbc,aes256-ctr,rijndael128-cbc,rijndael192-cbc,rijndael256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-sha1,hmac-md5,none
debug2: kex_parse_kexinit: hmac-sha1,hmac-md5,none
debug2: kex_parse_kexinit: zlib,none
debug2: kex_parse_kexinit: zlib,none
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug2: dh_gen_key: priv key bits set: 134/256
debug2: bits set: 1050/2048
debug1: sending SSH2_MSG_KEXDH_INIT
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug3: Wrote 272 bytes for a total of 1085
debug3: check_host_in_hostfile: filename /home/user/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 5
debug1: Host 'xxx.xxx.xxx.xxx' is known and matches the RSA host key.
debug1: Found key in /home/user/.ssh/known_hosts:5
debug2: bits set: 996/2048
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: Wrote 16 bytes for a total of 1101
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug3: Wrote 48 bytes for a total of 1149
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/user/.ssh/id_rsa ((nil))
debug2: key: /home/user/.ssh/id_dsa (0x7f5563b17000)
debug3: Wrote 80 bytes for a total of 1229
Authenticated with partial success.
debug1: Authentications that can continue: password,publickey
debug3: start over, passed a different list password,publickey
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/user/.ssh/id_rsa
debug3: no such identity: /home/user/.ssh/id_rsa
debug1: Offering public key: /home/user/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug3: Wrote 528 bytes for a total of 1757
debug1: Server accepts key: pkalg ssh-dss blen 434
debug2: input_userauth_pk_ok: SHA1 fp .............................
debug3: sign_and_send_pubkey
debug3: no such identity: /home/user/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
user@xxx.xxx.xxx.xxx's password:

but from the second machine i get the error in subject:

Code:
[user@machine2 ~]$ sftp -vvv user@xxx.xxx.xxx.xxx
Connecting to xxx.xxx.xxx.xxx...
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to xxx.xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22.
debug1: Connection established.
debug3: Not a RSA1 key file /home/user/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/user/.ssh/id_rsa type 1
debug3: Not a RSA1 key file /home/user/.ssh/id_dsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/user/.ssh/id_dsa type 2
ssh_exchange_identification: Connection closed by remote host
Couldn't read packet: Connection reset by peer

any idea about the above?

thanks a lot!
# 2  
Old 06-26-2014
Code:
debug3: Not a RSA1 key file /home/user/.ssh/id_rsa.

Check that your SSH key file is actually correct.
# 3  
Old 06-26-2014
ciao Carlo,

i renamed the files so that ssh won't try to use it (i'm trying to setup a password-based authentication), but the result it's the same:

Code:
[user@m1~]$ mv /home/user/.ssh/id_rsa /home/user/.ssh/id_rsaBAK
[user@m1~]$ mv /home/user/.ssh/id_dsa /home/user/.ssh/id_dsaBAK
[user@m1~]$ sftp -vvvvvvv user@xxx.xxx.xxx.xxx
Connecting to xxx.xxx.xxx.xxx...
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to xxx.xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/id_rsa type 1
debug1: identity file /home/user/.ssh/id_dsa type 2
ssh_exchange_identification: Connection closed by remote host
Couldn't read packet: Connection reset by peer

# 4  
Old 06-26-2014
Yes but you are still in that same session where you used keys... come out and connect yourself again...And you need to remove bothe sides...
# 5  
Old 06-26-2014
hello vbe,

i tried to logout and login again with no success (same result as before).

also i tried to run the command using the -o PubkeyAuthentication=no option as below

Code:
[user@m1 ~]$ sftp -vvv -o PubkeyAuthentication=no user@xxx.xxx.xxx.xxx
Connecting to xxx.xxx.xxx.xxx...
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to xxx.xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/id_rsa type 1
debug1: identity file /home/user/.ssh/id_dsa type 2
ssh_exchange_identification: Connection closed by remote host
Couldn't read packet: Connection reset by peer

but apparently this doesn't help neither Smilie

a point... xxx.xxx.xxx.xxx doesn't appear in the known_host file and i'm not promted to store the key. i would say that i'm facing a connectivity issue but apparently my client manages to estabilish the tcp connection

Code:
debug1: Connecting to xxx.xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22.
debug1: Connection established.

thanks!
# 6  
Old 06-27-2014
Host disallowed, maybe? Look in /etc/hosts.allow and /etc/hosts.deny on the target machine.
# 7  
Old 06-28-2014
Unfortunately the target machine is running windows. I used freeftpd that implements the sftp on that platform. Smilie

Client hosts.allow/deny are clear.
 

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