我们发现有些客户自己的linux服务器，有时候会出现502 Bad Gateway 的错误信息
现将处理方法整理如下
第一个crm要升级到最新版本
第二个服务器环境编译一下，编译的脚本如下
cd lnmp0.7-full/ php-5.2.17/
./buildconf --force
./configure --prefix=/usr/local/php --with-config-file-path=/usr/local/php/etc --with-mysql=/usr/local/mysql --with-mysqli=/usr/local/mysql/bin/mysql_config --with-iconv-dir --with-freetype-dir --with-jpeg-dir --with-png-dir --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-discard-path --enable-magic-quotes --enable-safe-mode --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --with-curlwrappers --enable-mbregex --enable-fastcgi --enable-fpm --enable-force-cgi-redirect --enable-mbstring --with-mcrypt --enable-ftp --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --without-pear --with-gettext --with-mime-magic --without-sqlite --without-pdo-sqlite
make ZEND_EXTRA_LIBS='-liconv'
make install