We have recently upgraded our version of curl because we are encountering more and more cases of being unable to establish connections due to deprecated ciphers.
We first encountered this error in 2022, and the only suggestion was to upgrade our version of curl. We have now done that, and the problem actually seems WORSE. Here is our version of curl. curl --version curl 8.14.1 (powerpc-ibm-aix7.1.5.0) libcurl/8.14.1 OpenSSL/3.0.10 zlib/1.2.13 libssh2/1.11.1 nghttp2/1.62.1 OpenLDAP/2.5.16 Release-Date: 2025-06-04 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss Features: alt-svc AsynchDNS GSS-API HSTS HTTP2 HTTPS-proxy IPv6 Kerberos Largefile libz NTLM SPNEGO SSL threadsafe UnixSockets Here is the error message that we are getting. I have removed all the identifying information. curl -k -v sftp://url.com:22/ --user 'USER:PASSWORD' * Host url.com:22 was resolved. * IPv6: (none) * IPv4: octet.octet.octet.octet, 18.222.41.6 * Trying octet.octet.octet.octet:22... * Connected to io.envestnet.com (octet.octet.octet.octet) port 22 * libssh2 cryptography backend: openssl compatible * User: USER * Failure establishing ssh session: -5, Unable to exchange encryption keys * closing connection #0 curl: (2) Failure establishing ssh session: -5, Unable to exchange encryption keys Werner Stolz Advisor, Senior Software Developer Office: 848.305.7158 Mobile: 630.404.3815 Chicago InvestCloud.com<https://www.investcloud.com/> | LinkedIn<https://www.linkedin.com/company/investcloud/> CNBC World's Top Fintech Companies 2024 ________________________________ Electronic Privacy Notice. This e-mail, and any attachments, contains information that is, or may be, covered by electronic communications privacy laws, and is also confidential and proprietary in nature. If you are not the intended recipient, please be advised that you are legally prohibited from retaining, using, copying, distributing, or otherwise disclosing this information in any manner. Instead, please reply to the sender that you have received this communication in error, and then immediately delete it. Thank you in advance for your cooperation. ________________________________
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