Detailed Requirements

Operating System
Our software has been tested on the widespread Linux and Windows web server platforms. Most likely, our software will run smoothly on other Unix based operating systems, but in that case we cannot guarantee flawless operation (product support is only available for installations on Linux and Windows machines).

Web Server
Our software has only been tested along with the web server "Apache" (http://httpd.apache.org). Apache has a market share of broadly 65% and is thus supported by most of todays web hosts. Most likely, our software will also work with other web servers, but in that case we cannot guarantee flawless operation (product support is only available for installations using the apache web server). If you want to take advantage of the SSL support integrated into yalst, the domain at which yalst is to be made available needs to support SSL as well (alternatively, you may use a so called SSL proxy). Standard web server ports (80 for unencrypted and 443 for encrypted pages) must be used for yalst.
In order to use the VNC-based remote assistance administrator privileges are required on this machine to install a repeater service daemon. The repeater package contains 32 and 64 bit binaries for Linux and the source code in order to build the repeater for other systems.
For audio and video chats you need to install the Wowza Media Server Pro on your system. This normally requires a dedicated server and administrator powers on that machine. Alternatively we offer a streaming service on a monthly rental basis. In this case no third-party software is needed on your server. Please visit our Customer Area for more information.

MySQL
Our software requires a working MySQL database (http://www.mysql.com). Irregardless how many licenses you are using, all information will be saved in one database. Currently, the only supported database is MySQL. The eldest MySQL database version that our software was tested on was 3.23.37 ().

PHP
PHP (http://www.php.net) is required to be installed at version 4.1.0 or above. Please take note, that MySQL 4.1 (or above) does not work together with older PHP-MySQL-Apis (3.23x). In this case, please use the MySQL 4.1 API, which is part of the PHP 4.4.0 or 5.05 (or above) package. The following PHP features are required to exist:
- image functions (for PNG output, not necessarily essential)
- MySQL support (usually available)
- BCMath support (usually available)
- send mail support using the mail() function
- PHP needs to be able to read and write files in certain sub-directories of your webspace
Starting from PHP 5.2.5 an appropriate ionCube Loader has to be installed via php.ini (respectively copied into the system-wide extensions folder). This PHP extension is normally loaded by yalst at runtime in older PHP versions.
If you meet the requirements listed above, that is not necessarily a 100% guarantee that yalst will run flawlessly on your system, as for example any arbitrary PHP function can be disabled through the configuration files. In case of doubt, please use the Trial Version (see below), which is identical to the regular Download Version in regards of the underlying PHP code. Also, whether or not yalst works in the so called PHP safe mode, is dependent on the restrictions set. If you are running PHP in safe mode, it is strongly suggested to test the requirements using our test script or the Trial Version.

Public IP Address/Domain
Our software only runs on web servers that are available through a "public" IP address. In other words, not within private networks (intranets). An exception to this rule is the Free Edition and Trial Version, which can also operate using the local network interface ("localhost", IP address 127.0.0.1), in case you have a web server and database installed on your local PC. You have to use an Internet domain for installation, only an IP address is not sufficient. Servers that keep changing their IP address are not supported (e.g. systems using services like "DynDNS").

Questions/Support?
If you have any questions regarding the requirements listed here, we will gladly help you out. Please feel free to contact us here! Our support team will also help you with anything regarding the installation. Of course, this service is free of charge!
Please take note, that we unfortunately cannot offer product support for Free Edition users.

Note:
If you have your own Linux server ("root server") available to install yalst on, and have admin permissions as well, you will be able to meet the requirements in any case. You might need to install software packages or make some changes to settings, but that is usually not an issue. It should be noted, that our software also works with most "normal" web space packages.

Test Requirements

If you're not sure, whether or not your server or webspace meet all the requirements necessary for a successful yalst installation, you may download a test script that will check if an installation is possible. The script is available in the following two file formats:
- (tar.gz format, 3.8 MB)
- (ZIP format, 3.8 MB)

Instructions:

1. Download one of the two files.
2. Unpack the respective file.
3. Transfer the unpacked files (including the "ioncube" folder with contents) to your server/webspace, at which you want to operate yalst on (e.g. via FTP).
4. Execute the ychecker.php script in your browser (by typing the full URL, e.g. "http://www.example.com/ychecker.php").
5. Your browser window will then display notification, whether or not all requirements could be met, or in the other case, what requirements could not be met (including hints, how possible issues could be resolved).

An alternative to the script is to download and install our free Trial Version. In this case, you could at the same time also check the Live Support functions made available on your web site!