[GH-ISSUE #4953] kex_exchange_identification: Connection closed by remote host

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Reference: github-starred/frp#3906

gitea-mirror commented

2026-05-05 14:29:31 -06:00

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Originally created by @YangZ1988 on GitHub (Aug 25, 2025).
Original GitHub issue: https://github.com/fatedier/frp/issues/4953

Bug Description

按照Example Usage在服务器和客户端分别启用了frps 和frpc，连接成功，
new proxy [ssh] type [tcp] success

但是执行ssh -vv -p port user@ip 出现以下错误

OpenSSH_9.9p1, LibreSSL 3.3.6
debug1: Reading configuration data ~/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files
debug1: /etc/ssh/ssh_config line 54: Applying options for *
debug2: resolve_canonicalize: hostname ip is address
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to ip [ip] port port.
debug1: Connection established.
debug1: identity file /Users/yang/.ssh/id_rsa type 0
debug1: identity file /Users/yang/.ssh/id_rsa-cert type -1
debug1: identity file /Users/yang/.ssh/id_ecdsa type -1
debug1: identity file /Users/yang/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/yang/.ssh/id_ecdsa_sk type -1
debug1: identity file /Users/yang/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /Users/yang/.ssh/id_ed25519 type -1
debug1: identity file /Users/yang/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/yang/.ssh/id_ed25519_sk type -1
debug1: identity file /Users/yang/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /Users/yang/.ssh/id_xmss type -1
debug1: identity file /Users/yang/.ssh/id_xmss-cert type -1
debug1: identity file /Users/yang/.ssh/id_dsa type -1
debug1: identity file /Users/yang/.ssh/id_dsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.9
kex_exchange_identification: Connection closed by remote host
Connection closed by ip port port

frpc Version

0.64.0

frps Version

System Architecture

server: linux/amd, client: linux/amd, remote login: macOS/arm

Configurations

server:

bindPort = x

auth.method = "token"
auth.tokenSource.type = "file"
auth.tokenSource.file.path = "pss"

client:

serverAddr = "x.x.x.x"
serverPort = x
transport.tls.enable = false
auth.method = "token"
auth.tokenSource.type = "file"
auth.tokenSource.file.path = "pss"

proxies
name = "ssh"
type = "tcp"
localIP = "y.y.y.y"
localPort = 22
remotePort = y

Logs

kex_exchange_identification: Connection closed by remote host
Connection closed by ip port port

Steps to reproduce

...

Affected area

Docs
Installation
Performance and Scalability
Security
User Experience
Test and Release
Developer Infrastructure
Client Plugin
Server Plugin
Extensions
Others

Originally created by @YangZ1988 on GitHub (Aug 25, 2025). Original GitHub issue: https://github.com/fatedier/frp/issues/4953 ### Bug Description 按照Example Usage在服务器和客户端分别启用了frps 和frpc，连接成功， new proxy [ssh] type [tcp] success 但是执行ssh -vv -p port user@ip 出现以下错误 OpenSSH_9.9p1, LibreSSL 3.3.6 debug1: Reading configuration data ~/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files debug1: /etc/ssh/ssh_config line 54: Applying options for * debug2: resolve_canonicalize: hostname ip is address debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling debug1: Connecting to ip [ip] port port. debug1: Connection established. debug1: identity file /Users/yang/.ssh/id_rsa type 0 debug1: identity file /Users/yang/.ssh/id_rsa-cert type -1 debug1: identity file /Users/yang/.ssh/id_ecdsa type -1 debug1: identity file /Users/yang/.ssh/id_ecdsa-cert type -1 debug1: identity file /Users/yang/.ssh/id_ecdsa_sk type -1 debug1: identity file /Users/yang/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /Users/yang/.ssh/id_ed25519 type -1 debug1: identity file /Users/yang/.ssh/id_ed25519-cert type -1 debug1: identity file /Users/yang/.ssh/id_ed25519_sk type -1 debug1: identity file /Users/yang/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /Users/yang/.ssh/id_xmss type -1 debug1: identity file /Users/yang/.ssh/id_xmss-cert type -1 debug1: identity file /Users/yang/.ssh/id_dsa type -1 debug1: identity file /Users/yang/.ssh/id_dsa-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_9.9 kex_exchange_identification: Connection closed by remote host Connection closed by ip port port ### frpc Version 0.64.0 ### frps Version 0.64.0 ### System Architecture server: linux/amd, client: linux/amd, remote login: macOS/arm ### Configurations server: bindPort = x auth.method = "token" auth.tokenSource.type = "file" auth.tokenSource.file.path = "pss" client: serverAddr = "x.x.x.x" serverPort = x transport.tls.enable = false auth.method = "token" auth.tokenSource.type = "file" auth.tokenSource.file.path = "pss" [[proxies]] name = "ssh" type = "tcp" localIP = "y.y.y.y" localPort = 22 remotePort = y ### Logs kex_exchange_identification: Connection closed by remote host Connection closed by ip port port ### Steps to reproduce 1. 2. 3. ... ### Affected area - [ ] Docs - [x] Installation - [ ] Performance and Scalability - [ ] Security - [x] User Experience - [ ] Test and Release - [ ] Developer Infrastructure - [ ] Client Plugin - [ ] Server Plugin - [ ] Extensions - [ ] Others

gitea-mirror closed this issue

2026-05-05 14:29:32 -06:00

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[GH-ISSUE #4953] kex_exchange_identification: Connection closed by remote host #3906