Contents

Introduction

问题

解决方案

Related Information

Introduction

本文包括如何讨论安全管理工具(SMA)和电子邮件安全工具(ESA)集成故障造成错误：“(3， ‘找不到配比的密钥交换算法。’)或“意外的EOF连接”和另外的症状。

背景信息

与ESA的SMA连接，当首先集成， SMA时为ESA提供以下密码/密匙交换算法：

kex_algorithms string: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521

encryption_algorithms_client_to_server string: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se

encryption_algorithms_server_to_client string: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se

在SMA和ESA连接以后设立， SMA为ESA提供以下密码/密匙交换算法：

kex_algorithms string: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

encryption_algorithms_client_to_server string [truncated]: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se

encryption_algorithms_server_to_client string [truncated]: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se

The information in this document was created from the devices in a specific lab environment.All of the devices used in this document started with a cleared (default) configuration.如果您的网络处于活动状态，请确保您了解所有命令的潜在影响。

问题

问题存在，当集成SMA对从的ESA GUI >管理工具>集中式服务> Security工具或CLI > applianceconfig。问题将提示在连接的一个错误，这归结于错过一些kex算法/密码算法的ESA。

1. (3, 'Could not find matching key exchange algorithm.')

2. Error — Unexpected EOF on connect.

解决方案

要解决此， ESA SSH密码配置需要被采购回到提供的默认值：

lab.esa.com> sshconfig

Choose the operation you want to perform:

- SSHD - Edit SSH server settings.

- USERKEY - Edit SSH User Key settings

- ACCESS CONTROL - Edit SSH whitelist/blacklist

[]> sshd

ssh server config settings:

Public Key Authentication Algorithms:

rsa1

ssh-dss

ssh-rsa

Cipher Algorithms:

aes128-ctr

aes192-ctr

aes256-ctr

aes128-cbc

3des-cbc

blowfish-cbc

cast128-cbc

aes192-cbc

aes256-cbc

rijndael-cbc@lysator.liu.se

MAC Methods:

hmac-md5

hmac-sha1

umac-64@openssh.com

hmac-ripemd160

hmac-ripemd160@openssh.com

hmac-sha1-96

hmac-md5-96

Minimum Server Key Size:

1024

KEX Algorithms:

diffie-hellman-group-exchange-sha256

diffie-hellman-group-exchange-sha1

diffie-hellman-group14-sha1

diffie-hellman-group1-sha1

ecdh-sha2-nistp256

ecdh-sha2-nistp384

ecdh-sha2-nistp521

的输出CLI >在逐步设置的sshconfig > sshd ：

[]> setup

Enter the Public Key Authentication Algorithms do you want to use

[rsa1,ssh-dss,ssh-rsa]>

Enter the Cipher Algorithms do you want to use

[aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se]>

Enter the MAC Methods do you want to use

[hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96]>

Enter the Minimum Server Key Size do you want to use

[1024]>

Enter the KEX Algorithms do you want to use

[diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521]>

Related Information

- Cisco电子邮件安全工具-终端用户指南

- Technical Support & Documentation - Cisco Systems

- 为集中化策略病毒和爆发检疫最佳实践

- ESA垃圾邮件检疫的全面的指南设置与SMA