CentOS/RHEL yum 默认安装的 subversion 是 1.6.11 版本，连VisualSVN服务器时或变更svn地址定位时会有"Key usage violation"的错误，如下
svn: OPTIONS of '
https://.../server':
SSL handshake Failed: SSL error: Key usage violation in certificate has been detected. (
https://...
)
网上查到，将subversion升级到最新版可解决该问题：
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/
)
按指示设置新的yum源，然后安装：
1.添加源(没有就新建文件)
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删除旧的包
yum remove subversion*
3.安装新的包
yum clean all
yum -y install subversion
SVN地址变更:
svn up #先更新本地
https://www.yiwindow.com/svn/hynhyh 变更为https://svn.weixinyiwindow.com/svn/hynhyh
svn sw --relocate https://www.yiwindow.com/svn/hynhyh https://svn.weixinyiwindow.com/svn/hynhyh
好了，现在试试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/
问题解决。