scp does not work. Finding the cause
17,554
Solution 1
debug1: Sending command: scp -v -d -t /tmp
[...]
debug2: exec request accepted on channel 0
SCP works by opening an SSH connection to the remote server, then invoking another copy of the scp program there. The two scp instances communicate with each other through the SSH link.
According to the log, your scp client successfully connected to the server, authenticated, and requested for the remote server to invoke scp to receive the files. However, it appears that the remote scp instance didn't actually start up correctly. One of these reasons seem to be likely:
You have something in your .bashrc, .profile, or similar file on the remote system which prevented scp from starting. The remote server invokes requested commands using your login shell by running the equivalent of
$SHELL -c 'the-requested-command'. Some things which you can put in your shell configuration files will prevent the shell from running the command. For example, if your .bashrc exec'ed a different shell, that would preventscpfrom working.Since you authenticated using an SSH key, your probably have an entry for the SSH key in the remote system's
.ssh/authorized_keysfile. There's a directive namedForceCommandthat can be placed in the authorized_keys file. If the key is subject to a forced command, then any request by the client to run a program will invoke the forced command, instead of the command requested by the client.The
scpprogram on the remote system may be malfunctioning. Or perhaps someone has replaced it with a different program.
Solution 2
It looks like your remote server is configured to ask a question when you log in. (You can check this with ssh user@server and see whether you get asked a question.) That code needs to be modified to ask its question only when running in an interactive shell.
For example, if you're using bash then in .bashrc:
read -p "What terminal type: " termtype
# ... other code that uses $termtype ...
you should consider something like this instead:
if [[ -n "$PS1" ]]
then
read -p "What terminal type: " termtype
# ... other code that uses $termtype ...
fi
Author by
khashashin
Updated on September 18, 2022Comments
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khashashin almost 2 years
I am trying to copy a file (*.crt) from local to remote server. Unfortunately, I don't have rights to open the
sshd_configfile on remote server. Someone in our team configured an ssh agent for me; I'm not sure where he put this script, but I can connect to this remote server without a problem. Here is the output of the following command:scp -vvv /cygdrive/c/Users/myaccount/Downloads/certs/*.crt user@server:/tmp>$ scp -vvv /cygdrive/c/Users/myaccount/Downloads/certs/*.crt user@server:/tmp Executing: program /usr/bin/ssh host server, user user, command scp -v -d -t /tmp OpenSSH_7.5p1, OpenSSL 1.0.2k 26 Jan 2017 debug2: resolving "server" port 22 debug2: ssh_connect_direct: needpriv 0 debug1: Connecting to server [124.67.80.20] port 22. debug1: Connection established. debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myaccount/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_7.5 debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4 debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to server:22 as 'user' debug3: hostkeys_foreach: reading file "/home/myaccount/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/myaccount/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from server debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 debug3: send packet: type 20 debug1: SSH2_MSG_KEXINIT sent debug3: receive packet: type 20 debug1: SSH2_MSG_KEXINIT received debug2: local client KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,[email protected],zlib debug2: compression stoc: none,[email protected],zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: [email protected],diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521 debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256 debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr debug2: MACs ctos: hmac-sha2-256,hmac-sha2-512 debug2: MACs stoc: hmac-sha2-256,hmac-sha2-512 debug2: compression ctos: none,[email protected] debug2: compression stoc: none,[email protected] debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: [email protected] debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none debug3: send packet: type 30 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug3: receive packet: type 31 debug1: Server host key: ecdsa-sha2-nistp256 SHA256:l19LX/CQNR9zxuvQpVrQn764H6u6wVxoprYFe6Z+Pf0 debug3: hostkeys_foreach: reading file "/home/myaccount/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/myaccount/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from server debug3: hostkeys_foreach: reading file "/home/myaccount/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/myaccount/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from 172.27.40.30 debug1: Host 'server' is known and matches the ECDSA host key. debug1: Found key in /home/myaccount/.ssh/known_hosts:1 debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey after 4294967296 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey after 4294967296 blocks debug2: key: /home/myaccount/.ssh/id_rsa (0x600072020), agent debug2: key: /home/myaccount/.ssh/id_rsa (0x0) debug2: key: /home/myaccount/.ssh/id_dsa (0x0) debug2: key: /home/myaccount/.ssh/id_ecdsa (0x0) debug2: key: /home/myaccount/.ssh/id_ed25519 (0x0) debug3: send packet: type 5 debug3: receive packet: type 7 debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512> debug3: receive packet: type 6 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug3: send packet: type 50 debug3: receive packet: type 51 debug1: Authentications that can continue: publickey debug3: start over, passed a different list publickey debug3: preferred 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: Offering RSA public key: /home/myaccount/.ssh/id_rsa debug3: send_pubkey_test debug3: send packet: type 50 debug2: we sent a publickey packet, wait for reply debug3: receive packet: type 60 debug1: Server accepts key: pkalg rsa-sha2-512 blen 279 debug2: input_userauth_pk_ok: fp SHA256:0Ye9/EO8URVsdDLmSgDFlACsxRCJVSTtTmwNYr8SpZE debug3: sign_and_send_pubkey: RSA SHA256:0Ye9/EO8URVsdDLmSgDFlACsxRCJVSTtTmwNYr8SpZE debug3: send packet: type 50 debug3: receive packet: type 52 debug1: Authentication succeeded (publickey). Authenticated to server([124.67.80.20]:22). debug2: fd 5 setting O_NONBLOCK debug2: fd 6 setting O_NONBLOCK debug1: channel 0: new [client-session] debug3: ssh_session2_open: channel_new: 0 debug2: channel 0: send open debug3: send packet: type 90 debug1: Requesting [email protected] debug3: send packet: type 80 debug1: Entering interactive session. debug1: pledge: network debug3: receive packet: type 80 debug1: client_input_global_request: rtype [email protected] want_reply 0 debug3: receive packet: type 91 debug2: callback start debug2: fd 3 setting TCP_NODELAY debug3: ssh_packet_set_tos: set IP_TOS 0x08 debug2: client_session2_setup: id 0 debug1: Sending command: scp -v -d -t /tmp debug2: channel 0: request exec confirm 1 debug3: send packet: type 98 debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 debug2: channel 0: rcvd adjust 2097152 debug3: receive packet: type 99 debug2: channel_input_status_confirm: type 99 id 0 debug2: exec request accepted on channel 0 debug3: send packet: type 1 debug1: channel 0: free: client-session, nchannels 1 debug3: channel 0: status: The following connections are open:^here everything hangs and after few minutes, I click Ctrl+C then comes this:
#0 client-session (t4 r0 i0/0 o0/0 fd 5/6 cc -1) debug3: fd 0 is not O_NONBLOCK debug3: fd 1 is not O_NONBLOCK Killed by signal 2.Where can the problem lie?
@roaima Here is result of
ls -ld:╔═myaccount ▷ w00d76:[~]: ╚> ls -ld /cygdrive/c/Users/myaccount /Downloads/certs/*.crt -rwx------+ 1 myaccount Domain Users 5037 17. Apr 12:40 /cygdrive/c/Users/myaccount/Downloads/certs/dm.cogist.com_server.crt -rwx------+ 1 myaccount Domain Users 5033 17. Apr 12:37 /cygdrive/c/Users/myaccount/Downloads/certs/dm1.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5037 17. Apr 12:41 /cygdrive/c/Users/myaccount/Downloads/certs/dm2.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5041 17. Apr 12:38 /cygdrive/c/Users/myaccount/Downloads/certs/dm1.cogist.com_server.crt -rwx------+ 1 myaccount Domain Users 5053 17. Apr 12:35 /cygdrive/c/Users/myaccount/Downloads/certs/dm3.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5069 17. Apr 12:36 /cygdrive/c/Users/myaccount/Downloads/certs/dm3.cogist.com_server.crt -rwx------+ 1 myaccount Domain Users 5025 17. Apr 12:30 /cygdrive/c/Users/myaccount/Downloads/certs/dm4.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5025 17. Apr 12:35 /cygdrive/c/Users/myaccount/Downloads/certs/dm5.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5021 17. Apr 12:33 /cygdrive/c/Users/myaccount/Downloads/certs/dm6.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5029 17. Apr 12:39 /cygdrive/c/Users/myaccount/Downloads/certs/dm7.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5025 17. Apr 12:40 /cygdrive/c/Users/myaccount/Downloads/certs/dm8.cogist.ch_server.crt -rwx------+ 1 myaccount Domain Users 5029 17. Apr 12:32 /cygdrive/c/Users/myaccount/Downloads/certs/dm9.cogist.ch_server.crt@roaima I'm logged in using ssh myaccount@server and here was no question.
╔═myaccount ▷ w00d76:[~]: ╚> ssh myaccount@server Last login: Wed Apr 18 11:38:30 2018 from w00d76.net.ch server.net.ch Inventory number: 25422250 OS responsible: IT245 APPL responsible: IT245 APPL description: Gateway Server Server function: Produktion Red Hat Enterprise Linux Server release 7.4 (Maipo) (x86_64) IT2 Operations [email protected] "akunamatata -> no worries mate .." ╔═myaccount ▷ server:[~]: ╚>-
Gerard H. Pille about 6 yearsDo you have an anti-virus on your or the remote system? -
khashashin about 6 yearsI'm not sure about the antivirus, but there is a firewall. Other staff can do
scpbut on my PC something wrong. We all have actually same rights. @Kusalananda it's from Cygwin -
Jeff Schaller about 6 yearsAre you scp’ing something like a socket or pipe? -
khashashin about 6 yearsnot sure what do you mean? I'm scp'ing a file from local to remote, What does mean scp'ing socket or pipe?
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Jeff Schaller about 6 yearsIt looks like you’re copying files from /tmp, so I wondered if there were sockets or fifo’s in /tmp that were hanging scp.
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khashashin about 6 yearsThanks for explaining. It seems like right answer. I'll give you feedback tomorrow.
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khashashin about 6 yearsThansk. it was really because of my .bashrc file
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dr0i over 4 yearsI had to silence commands in
.bashrcby appending2>&1>/dev/nullto them.
