CentOS/RHEL yum 安裝的 subversion 是 1.6.11 版本，連VisualSVN服務器時會有"Key usage violation"的錯誤，如下
svn: OPTIONS of ' https://.../server': SSL handshake failed: SSL error: Key usage violation in certificate has been detected. ( https://... )

網上查到，將subversion升級到最新版可解決該問題：
Install Subversion 1.8.9 ( SVN Client ) on CentOS/RHEL
Thanks to Wandisco, which is maintaining the rpm packages for latest Subversion version.
( http://tecadmin.net/install-subversion-1-8-on-centos-rhel/ )

按指示設置新的yum源，然后安裝：

1.添加源
vim /etc/yum.repos.d/wandisco-svn.repo

[WandiscoSVN]
name=Wandisco SVN Repo
baseurl= http://opensource.wandisco.com/centos/$releasever/svn-1.8/RPMS/$basearch/
enabled=1
gpgcheck=0
2、yum刪除舊的包
yum remove subversion*
3.安裝新的包
yum clean all
yum install subversion

好了，現在試試SVN的版本
svn --version
svn, version 1.8.15 (r1718365)
???compiled Dec 11 2015, 14:28:48 on x86_64-redhat-linux-gnu

Copyright (C) 2015 The Apache Software Foundation.
This software consists of contributions made by many people;
see the NOTICE file for more information.
Subversion is open source software, see http://subversion.apache.org/

The following repository access (RA) modules are available:

* ra_svn : Module for accessing a repository using the svn network protocol.
??- with Cyrus SASL authentication
??- handles 'svn' scheme
* ra_local : Module for accessing a repository on local disk.
??- handles 'file' scheme
* ra_serf : Module for accessing a repository via WebDAV protocol using serf.
??- using serf 1.3.7
??- handles 'http' scheme
??- handles 'https' scheme

問題解決。

總結

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