I handle several servers with CentOS but currently the server 09 can not make the connection by sftp not even by ssh to the ftp server (92) since the processes in which the information is brought are at dawn, and noticing during these weeks that it has become slow (too much) when trying to mediate the transfer rate for a file in scp I realize that I can not access (if I can ping and if we see it but can not connect or by sftp, ssh and scp)
Running the command to debug the ssh tells me that the keys can not find them if they are (and already delete the keys and the known_host in 92 to recreate them but nothing)
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug2: resolving "192.168.1.92" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 192.168.1.92 [192.168.1.92] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
ssh_exchange_identification: read: Connection reset by peer
Thank you very much in advance