Hello,
We need to connect to an SFTP server “mydestination.tld” through a proxy server. I can establish the connection SFTP as follows. ----------------- */home/ #* sftp -o User=myuser -o ProxyCommand="nc -X 5 -x my-proxy:1080 %h %p" mydestination.tld Connecting to mydestination.tld... The authenticity of host 'sectrans1.allianz.at (<no hostip for proxy command>)' can't be established. RSA key fingerprint is Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'mydestination.tld’ (RSA) to the list of known hosts. Password: sftp> ls PROD TEST bin etc home lib srv usr var sftp> exit ----------------- But when I use, curl fort he same purpose. It fails with SSH error. ----------------- # curl -V curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.27.1 zlib/1.2.3 libidn/1.18 libssh2/1.4.2 Protocols: tftp ftp telnet dict ldap ldaps http file https ftps scp sftp Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz # curl -vvv -x my-proxy:1080 sftp://mydestination.tld/ * About to connect() to proxy my-proxy port 1080 (#0) * Trying 10.10.10.51... connected * Connected to my-proxy (10.10.10.51) port 1080 (#0) * Failure establishing ssh session * Closing connection #0 curl: (2) Failure establishing ssh session ---------------- >From the server, I can SFTP using curl if we don’t use a proxy. -------------- # curl -vvv sftp://direct-sftp-server.tld/ -u user Enter host password for user 'user': * About to connect() to direct-sftp-server.tld 22 (#0) * Trying 10.10.10.93... connected * Connected to sla03925.srv.allianz (10.10.10.93) port 22 (#0) * SSH MD5 fingerprint: d1b498a488ac879a090acd09daa1d4bb * SSH host check: 0, key: * SSH authentication methods available: publickey,gssapi-keyex,gssapi- with-mic,password * Using ssh private key file * SSH public key authentication failed: Unable to extract public key from private key file: Unable to open private key file * Initialized password authentication * Authentication complete dr-xr-xr-x 412 root root 0 Sep 5 19:30 proc drwxr-xr-x 106 root root 4096 Jan 23 11:08 home drwxrwxrwx 11 root root 4096 Feb 6 07:26 disk2 -rw-r--r-- 1 root root 4 Dec 11 2015 .kdhrystones -------------- So, the issue is when we use proxy to SFTP with curl it fails. Please help on this I could find same issue discussed https://curl.haxx.se/mail/ archive-2012-03/0021.html , but it’s very old and hope the pateches already present in the latest installed version?
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