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Archive for the ‘Apache’ Category

Jun 25
2011

Apache: [warn] NameVirtualHost *:80 has no VirtualHosts

Last updated: June 25th, 2011

$ /etc/init.d/apache2 restart

After configuring Apache server settings on the name server, you may encounter a message “[warn] NameVirtualHost 192.168.1.3:80 has no VirtualHosts”

The issue may be due to more than one entry of NameVirtualHost lines in the configuration settings. You can find this out by

$ grep NameVirtual * -R
site1:NameVirtualHost *:80
site2:NameVirtualHost *:80

Linux Solution: Remove one of the occurance of the NameVirtualHost and the warning message that you receive will vanish.

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Posted in Apache, LINUX | No Comments »

Nov 24
2010

How to configure virtual hosts in Apache?

Last updated: May 29th, 2011

Apache server documentation provides us clear set of steps to do name/IP based virtual hosting which is stated in the below URL

http://httpd.apache.org/docs/2.0/vhosts/examples.html

- Running several name-based web sites on a single IP address.
- Name-based hosts on more than one IP address.
- Serving the same content on different IP addresses
- Running different sites on different ports
- IP-based virtual hosting
- Mixed port-based and ip-based virtual hosts
- Mixed name-based and IP-based vhosts
- Using Virtual_host and mod_proxy together
- Migrating a name-based vhost to an IP-based vhost

- Using the ServerPath directive

Posted in Apache | No Comments »

Apr 01
2010

Apache: client denied by server configuration error

Last updated: April 1st, 2010

Apache Error log shows the message “Client denied by server configuration” and the user sees “Forbidden Access” when they try to visit a web page.

Solution:

Search for the apache configuration file (httpd.conf or vhosts.conf if you have configured a virtual host). Check for the directory permission set for the document root of the web site in question and do the following changes. (more…)

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Posted in Apache, LINUX | No Comments »

Mar 25
2010

Setting up Zend Framework – for Beginners

Last updated: March 23rd, 2010

Download the latest version of Zend framework from
http://framework.zend.com/download/latest

At the time of writing it was 1.10.2 available at Zend 1.10.2

$ pwd
/tmp

$ wget http://framework.zend.com/releases/ZendFramework-1.10.2/ZendFramework-1.10.2.tar.gz
(more…)

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Posted in Apache, LINUX, PHP | No Comments »

Nov 10
2009

Query string limit in GET data and Size limit in POST Data

Last updated: November 11th, 2009

RFC 2616 – Section 3 states:

“Servers should be cautious about depending on URI lengths above 255 bytes because some older client or proxy implementations may not properly support these lengths.”

Different browser agents support different URI length acceptance. In addition, servers too play a role in accepting/denying URI’s over certain length which may either truncate the URI or may give lengthy URI message indications.

It is always advisable to rely on shorter URI’s and to post data when more field sets are to be transferred across web pages.

POST data too has its limit. In this case, it is the size of the data which is controlled by the server settings.

Some interesting discussions:

Limit on query string GET URL parameters

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Posted in Apache, General, HTML, Tips, Tricks, Guides | No Comments »

Sep 10
2009

Generating Certificate for validation (CSR generation)

Last updated: September 10th, 2009

In order to install SSL certificates on your Apache server you need to generate a key pair and a CSR (certificate signing request) as the first step. The following points will guide you in the creation of CSR file.

Once you finish generating the CSR file, you need to paste the content of the CSR file on to the SSL certificate request page in order for the certificate authorities to start their verification process.

Command line prompts in a Linux box

Find where openssl is installed and navigated to that directory
$ whereis openssl

Mostly it will be at /usr/bin/. If it is in a different path, then navigate to that directory path
$ cd /usr/bin
(more…)

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Posted in Apache, LINUX, Security | No Comments »

Aug 30
2009

Apache Error Log

Last updated: September 3rd, 2009

Apache Error Log Expected “</File> but saw </Files>”

Check the error log file (in ubuntu it is in /var/log/apache2/error.log) for the above stated error message. Check the .htaccess file or the apache configuration files where you have restricted file permission using File Directive.

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Posted in Apache | No Comments »

Aug 16
2009

Premature end of script headers: apache error

Last updated: August 11th, 2009

Apache errors and the approach to solve it

Premature end of script headers
500 Internal Server Error
The specified CGI application misbehaved by not returning a complete set of HTTP headers.

Some troubleshooting tips:

i) Check /var/log/apache2/error.log (in ubuntu, check the respective apache error log location for the messages)

ii) Check if the content type of the page is correctly set for the html content output.

print “Content-type: text/html\n\n”;

iii) Check if a valid permission has been given for the file to get executed. The file need permission 755 for it to be executed on the server.

iv) Check if the configuration path, inclusion path are set correctly in the referenced programs

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Posted in Apache, Linux Server, Tips, Tricks, Guides | No Comments »

Aug 15
2009

Permission denied: exec of failed in Apache Server

Last updated: August 11th, 2009

Apache Permission Denied Error can be caused due to one of many configuration mistakes listed below

Check the apache configuration settings

i) The first is the reference to folder where cgi or perl files will reside and its execute permission settings

 <ScriptAlias /cgi-bin/ /usr/local/cgi-bin/>
 <Directory "/usr/local/cgi-bin">
     AllowOverride None
     Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
     Order allow,deny
     Allow from all
 </Directory>

ii) The second is the proper add handlers that are set for the file execution

AddHandler cgi-script .cgi .pl
<Files ~ "\.pl$">
    Options +ExecCGI
</Files>
<Files ~ "\.cgi$">
   Options +ExecCGI
</Files>

Check the apache error log for any messages (/var/log/apache2/error.log).

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Posted in Apache, Linux Server, Tips, Tricks, Guides | No Comments »

Aug 08
2009

How to hide Apache version, Modules loaded, PHP Version?

Last updated: August 4th, 2009

It is often advisable not to disclose information than is necessary when web request are made to Apache server.

By default, Apache displays the version of the server, modules loaded in the server and the version of PHP if PHP is configured with Apache.

In httpd.conf file, set the following directives.

ServerSignature Off
ServerTokens ProductOnly

By default, ServerSignature is set to Off and ServerTokens is set to Full in most Linux distros.

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Posted in Apache, Security, Tips, Tricks, Guides | No Comments »

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