nginx的配置问题 403.10 禁止访问：配置无效 

今天第一次用nginx，apt-get安装的，打开nginx.config,里面是这样的 #mail {

#       # See sample authentication script at:

#       # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript

#

#       # auth_http localhost/auth.php;

#       # pop3_capabilities "TOP" "USER";

#       # imap_capabilities "IMAP4rev1" "UIDPLUS";

#

#       server {

#               listen     localhost:110;

#               protocol   pop3;

#               proxy      on;

#       }

#

#       server {

#               listen     localhost:143;

#               protocol   imap;

#               proxy      on;

#       }

跟那些网上说的不一样啊，这什么情况？怎么设置
开始是nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
在http里面加了server {        listen 9000; ，于是nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) nginx: [emerg] bind() to 0.0.0.0:9000 failed (98: Address already in use) ，请这方面熟悉的朋友帮看看