我正在尝试通过外部IP地址连接到我新安装的Apache Web服务器。通过127.0.0.1连接是正常的，这只是使用外部IP地址时的一个问题。
我的操作系统是Ubuntu 13.10。我正在使用Apache 2.4并在端口80上进行侦听。
我已在路由器上设置转发，并使用http://canyouseeme.org/处的服务进行检查，其中端口80显示为已打开。我可以使用我的外部IP地址通过telnet建立连接并指定端口80，并且还检查了http://downforeveryoneorjustme.com/它说我的网站已启动的位置???
如果有帮助我也尝试了所有这些与其他端口进行测试。
我的ufw不活跃，但是，我的iptables中有一行我作为我努力解决的一部分而添加，其内容如下：
26 1557 ACCEPT tcp -- any any anywhere anywhere tcp dpt:http
如果有帮助，我已将我的Apache配置文件包含在下面。
# This is the main Apache server configuration file. It contains the
# configuration directives that give the server its instructions.
# See http://httpd.apache.org/docs/2.4/ for detailed information about
# the directives and /usr/share/doc/apache2/README.Debian about Debian specific
# hints.
#
#
# Summary of how the Apache 2 configuration works in Debian:
# The Apache 2 web server configuration in Debian is quite different to
# upstream's suggested way to configure the web server. This is because Debian's
# default Apache2 installation attempts to make adding and removing modules,
# virtual hosts, and extra configuration directives as flexible as possible, in
# order to make automating the changes and administering the server as easy as
# possible.
# It is split into several files forming the configuration hierarchy outlined
# below, all located in the /etc/apache2/ directory:
#
# /etc/apache2/
# |-- apache2.conf
# | `-- ports.conf
# |-- mods-enabled
# | |-- *.load
# | `-- *.conf
# |-- conf-enabled
# | `-- *.conf
# `-- sites-enabled
# `-- *.conf
#
#
# * apache2.conf is the main configuration file (this file). It puts the pieces
# together by including all remaining configuration files when starting up the
# web server.
#
# * ports.conf is always included from the main configuration file. It is
# supposed to determine listening ports for incoming connections which can be
# customized anytime.
#
# * Configuration files in the mods-enabled/, conf-enabled/ and sites-enabled/
# directories contain particular configuration snippets which manage modules,
# global configuration fragments, or virtual host configurations,
# respectively.
#
# They are activated by symlinking available configuration files from their
# respective *-available/ counterparts. These should be managed by using our
# helpers a2enmod/a2dismod, a2ensite/a2dissite and a2enconf/a2disconf. See
# their respective man pages for detailed information.
#
# * The binary is called apache2. Due to the use of environment variables, in
# the default configuration, apache2 needs to be started/stopped with
# /etc/init.d/apache2 or apache2ctl. Calling /usr/bin/apache2 directly will not
# work with the default configuration.
# Global configuration
ServerName localhost
#
# ServerRoot: The top of the directory tree under which the server's
# configuration, error, and log files are kept.
#
# NOTE! If you intend to place this on an NFS (or otherwise network)
# mounted filesystem then please read the Mutex documentation (available
# at <URL:http://httpd.apache.org/docs/2.4/mod/core.html#mutex>);
# you will save yourself a lot of trouble.
#
# Do NOT add a slash at the end of the directory path.
#
#ServerRoot "/etc/apache2"
#
# The accept serialization lock file MUST BE STORED ON A LOCAL DISK.
#
Mutex file:${APACHE_LOCK_DIR} default
#
# PidFile: The file in which the server should record its process
# identification number when it starts.
# This needs to be set in /etc/apache2/envvars
#
PidFile ${APACHE_PID_FILE}
#
# Timeout: The number of seconds before receives and sends time out.
#
Timeout 300
#
# KeepAlive: Whether or not to allow persistent connections (more than
# one request per connection). Set to "Off" to deactivate.
#
KeepAlive On
#
# MaxKeepAliveRequests: The maximum number of requests to allow
# during a persistent connection. Set to 0 to allow an unlimited amount.
# We recommend you leave this number high, for maximum performance.
#
MaxKeepAliveRequests 100
#
# KeepAliveTimeout: Number of seconds to wait for the next request from the
# same client on the same connection.
#
KeepAliveTimeout 5
# These need to be set in /etc/apache2/envvars
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}
#
# HostnameLookups: Log the names of clients or just their IP addresses
# e.g., www.apache.org (on) or 204.62.129.132 (off).
# The default is off because it'd be overall better for the net if people
# had to knowingly turn this feature on, since enabling it means that
# each client request will result in AT LEAST one lookup request to the
# nameserver.
#
HostnameLookups Off
# ErrorLog: The location of the error log file.
# If you do not specify an ErrorLog directive within a <VirtualHost>
# container, error messages relating to that virtual host will be
# logged here. If you *do* define an error logfile for a <VirtualHost>
# container, that host's errors will be logged there and not here.
#
ErrorLog ${APACHE_LOG_DIR}/error.log
#
# LogLevel: Control the number of messages logged to the error_log.
# Available values: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the log level for particular modules, e.g.
# "LogLevel info ssl:warn"
#
LogLevel warn
# Include module configuration:
IncludeOptional mods-enabled/*.load
IncludeOptional mods-enabled/*.conf
# Include list of ports to listen on
Include ports.conf
# Sets the default security model of the Apache2 HTTPD server. It does
# not allow access to the root filesystem outside of /usr/share and /var/www.
# The former is used by web applications packaged in Debian,
# the latter may be used for local directories served by the web server. If
# your system is serving content from a sub-directory in /srv you must allow
# access here, or in any related virtual host.
<Directory />
Options FollowSymLinks
AllowOverride None
Require all denied
</Directory>
<Directory /usr/share>
AllowOverride None
Require all granted
</Directory>
<Directory /var/www>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>
#<Directory /srv/>
# Options Indexes FollowSymLinks
# AllowOverride None
# Require all granted
#</Directory>
# AccessFileName: The name of the file to look for in each directory
# for additional configuration directives. See also the AllowOverride
# directive.
#
AccessFileName .htaccess
#
# The following lines prevent .htaccess and .htpasswd files from being
# viewed by Web clients.
#
<FilesMatch "^\.ht">
Require all denied
</FilesMatch>
#
# The following directives define some format nicknames for use with
# a CustomLog directive.
#
# These deviate from the Common Log Format definitions in that they use %O
# (the actual bytes sent including headers) instead of %b (the size of the
# requested file), because the latter makes it impossible to detect partial
# requests.
#
# Note that the use of %{X-Forwarded-For}i instead of %h is not recommended.
# Use mod_remoteip instead.
#
LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
# Include of directories ignores editors' and dpkg's backup files,
# see README.Debian for details.
# Include generic snippets of statements
IncludeOptional conf-enabled/*.conf
# Include the virtual host configurations:
IncludeOptional sites-enabled/*.conf
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
ports.conf
# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default
Listen 0.0.0.0:80
<IfModule ssl_module>
Listen 443
</IfModule>
<IfModule mod_gnutls.c>
Listen 443
</IfModule>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
/ 000-default.conf启用位点-
<VirtualHost *:80>
# The ServerName directive sets the request scheme, hostname and port that
# the server uses to identify itself. This is used when creating
# redirection URLs. In the context of virtual hosts, the ServerName
# specifies what hostname must appear in the request's Host: header to
# match this virtual host. For the default virtual host (this file) this
# value is not decisive as it is used as a last resort host regardless.
# However, you must set it for any further virtual host explicitly.
ServerName localhost
ServerAdmin webmaster@localhost
DocumentRoot /var/www
# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
#Include conf-available/serve-cgi-bin.conf
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
如果有人可以通过指向正确的方向来提供帮助，那将会非常有帮助。
（请注意，我现在已将侦听端口更改为8000）
sudo netstat -napW | grep apache
tcp6 0 0 :::8000 :::* LISTEN 1118/apache2
关于telnet（telnet xxx.xxx.xxx.xxx 8000），它现在表现不同，因为它不再连接。它只是尝试连接然后超时。尽管我的端口8000在canyouseeme.org上显示为开放状态，但是对于每个人来说也不再说它了。
我的访问日志仅显示本地连接。我不认为错误日志显示任何内容，但有条目，并且作为新手我不愿意假设所以我已经包括下面的最后几个条目。
normal operations
[Fri Dec 27 22:20:05.672859 2013] [core:notice] [pid 19548:tid 139673813047168] AH00094: Command line: '/usr/sbin/apache2'
[Fri Dec 27 22:49:55.262428 2013] [mpm_event:notice] [pid 19548:tid 139673813047168] AH00491: caught SIGTERM, shutting down
[Sat Dec 28 09:16:57.693712 2013] [mpm_event:notice] [pid 1118:tid 140053653940096] AH00489: Apache/2.4.6 (Ubuntu) configured -- resuming normal operations
[Sat Dec 28 09:16:57.705967 2013] [core:notice] [pid 1118:tid 140053653940096] AH00094: Command line: '/usr/sbin/apache2'
另外，我不知道这是否相关，但我刚刚在外部IP地址上对端口8000进行了nmap扫描，并显示为已过滤？结果如下：
PORT STATE SERVICE VERSION
8000/tcp filtered http-alt
更多信息......
我怀疑它可能不会直接成为Apache的问题！我刚刚尝试在同一个端口上设置netcat监听，在建立连接并且发生同样的情况时，它将提供一个小的HTML文件。 Netcat通过127.0.0.1和192.168.1.2（我的本地IP地址）提供文件，但不是通过外部IP地址？这是我使用的：
while true; do nc -l 192.168.1.2 -p 8000 -q 1 < test.html; done
我也尝试过：
while true; do nc -l 0.0.0.0 -p 8000 -q 1 < test.html; done
但无济于事。
*****耶！这是工作*****
这是一个组合的东西，虽然其中一个我仍然不明白。
这里的主要问题是我必须是某种白痴，因为我不知道你无法在不使用网络环回的情况下从局域网内部连接到外部IP地址。事实证明，我的路由器不支持它。我以前读过这个，我试图通过使用外部服务（downforeveryone等）来取消测试。
我没有得到的奇怪的事情（我认为它更复杂）是由于某种原因我不能在8000上前进？如果我这样做那么它就不起作用了。
目前我还在Apache上侦听端口8000，我的路由器将请求从端口80转发到端口8000，这很好;但是，如果我将路由器上的端口更改为8000，那么它将从8000转发到8000，那么它就无法工作。