Nagios常见问题1:
It appears as though you do not have permission to view information for any of the hosts you requested
临时解决:
sed -i 's/use_authentication=1/use_authentication=0/g' /usr/local/nagios/etc/cgi.cfg
(取消了认证 可以浏览主机状态 但是无法在 nagios web端 执行外部命令 )
解决:
登陆 nagios web接口的用户，需要和 /usr/local/nagios/etc/cgi.cfg 里面配置的用户匹配，没有可以手动添加，用逗号隔开。
Nagios常见问题2:
Sorry Dave, I can't let you do that...
It seems that you have chosen to not use the authentication functionality of the CGIs.
I don't want to be personally responsible for what may happen as a result of allowing unauthorized users to issue commands to Nagios,so you'll have to disable this safeguard if you are really stubborn and want to invite trouble.
Read the section on CGI authentication in the HTML documentation to learn how you can enable authentication and why you should want to.
原因 : 未开启认证
解决：开启认证可解决问题，编辑文件 /usr/local/nagios/etc/cgi.cfg，将 use_authentication 值设成1 (0/1 关闭/开启)use_authentication=1，并重启 nagios service nagios restart
Nagios常见问题3:
It appears as though you do not have permission to view information for any of the hosts you requested...
If you believe this is an error, check the HTTP server authentication requirements for accessing this CGI
and check the authorization options in your CGI configuration file.
原因 : 认证用户不正确
开启认证：认证的用户必须是 cgi.cfg 配置文件里有的 默认是 nagiosadmin，如果你新建的其他用户，需要添加进去，多用户用逗号分开
authorized_for_system_information=nagiosadmin
authorized_for_configuration_information=nagiosadmin
authorized_for_system_commands=nagiosadmin
authorized_for_all_services=nagiosadmin
authorized_for_all_hosts=nagiosadmin
authorized_for_all_service_commands=nagiosadmin
authorized_for_all_host_commands=nagiosadmin
如果不是 nagiosadmin 需要到后面添加，例子 authorized_for_system_information=nagiosadmin,admin
Nagios常见问题4:
调用外部命令错误，可能权限不够
解决:
临时解决:
chown -R nagios.nagcmd /usr/local/nagios/var/rw
chmod -R 777 /usr/local/nagios/var/rw
为什么说临时解决 ? 因为重启nagios后，权限会还原，还是没权限执行。
解决:
在安装 nagios 时，就要把用户选对，然后再安装。
./configure --with-group=nagios --with-user=nagios --with-command-group=nagcmd --with-gd-lib=/usr/lib --with-gd-inc=/usr/include
make all
make install
make install-init
make install-config
make install-commandmode
===
rw agios.cmd 权限是 nagios.nagios，还需要把 web用户 加入到 nagios组里 这样才有权限执行 nagios.cmd
Nagios常见问题5:
3D浏览错误，提示下载 statuswrl.cgi
解决: 需安装3D浏览插件
原因是未安装支持vrml 3D浏览的插件，vrml 面向对象的三维造型语言，需要安装 vrml 支持插件才能浏览，Cortona VRML Client 是一个优秀的VRML浏览插件
http://download.pcpop.com/Down/48664.html
http://down2.pcpop.com/softdown/exp/cortvrml.zip
Nagios常见问题6:
查看帮助文档时，无法看到图片
原因是url错误
图片源地址 http://nagios_ip/pub/images/reachability1.png
实际地址 /usr/local/nagios/share/docs/images/reachability1.png
解决：配置apache加入别名
Alias /pub "/usr/local/nagios/share/docs"
apachectl restart
重启apache 问题解决
nagios的这些常见问题以及解决办法你学会了吗？相信这是一份很有用的资源，希望这些办法能够帮你解决困扰。
来源：oschina
链接：https://my.oschina.net/u/726934/blog/97869