SSH Connection Refused by TCP Wrapper (Doc ID 2374573.1)

Last updated on MARCH 24, 2023

Applies to:

Symptoms

Server failed to login through ssh with below errors.

From ssh client:

$ ssh -vvv grid@172.30.1.xx
OpenSSH_7.6p1, LibreSSL 2.6.2
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 172.30.1.xx port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yaozhenqiang/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6
ssh_exchange_identification: read: Connection reset by peer

From ssh server:

# /usr/sbin/sshd -D -ddd
....snip....
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug3: fd 5 is not O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug3: send_rexec_state: entering fd = 8 config len 583
debug3: ssh_msg_send: type 0
debug3: send_rexec_state: done
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
debug1: Connection refused by tcp wrapper

Changes

Cause

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