Protocols

Terminal Servers – the Secret Behind Remote Hosts

Terminal servers: definition, basics, and advantages

In the days of mainframe computers and the first smaller networks, terminals were a crucial building block for sharing hardware and software resources. It is no coincidence that terminal servers – the central administrative entity of such networks – are in demand decades later, now that applications are to be made available to multiple users.

DNSSEC – authenticated name resolution

DNSSEC: internet standards for authenticated name resolution

Without the Domain Name System, users of the World Wide Web would have serious problems when trying to load websites and other online presences. It’s only thanks to this system that internet addresses appear in their trusted text format: they’re actually nothing more than combinations of numbers. The communication between browser and name server responsible for this isn’t actually as secure as you...

PHP 7.1

PHP 7.1 EOL - support is expiring

PHP 7.1 has many fans in the web developer community. But now it's time to say goodbye and switch to a newer version. The development team has set the end-of-life date for PHP 7.1 for the 1st of December, 2019. From that date on, the version will receive no further updates. Even security gaps will no longer be closed by the official developers. What should you do now?

CardDAV

CardDAV: contact details always at hand – wherever you are

Whether on mobile or on your PC, being able to access address and contact details is important for personal and professional reasons. With CardDAV, contact information can be stored and synchronised across different devices and accessed by multiple users. But what is CardDAV, how does the network protocol work and what benefits does it offer?

CalDAV

CalDAV - What’s behind the network protocol?

The network protocol CalDAV allows you to synchronise calendar data such as appointments and meetings on your PC, smartphone or tablet. The events are then displayed presentably in iCalender format and managed in a WebDAV environment. We’ll explain what CalDAV is exactly and how you can use it yourself.

HTTP 408: How to fix the “Request Timeout” error

HTTP 408: how to fix the timeout error

Permanent availability is one of the most important things when it comes to a website. However, even the best technical conditions do not offer a 100% guarantee that a website will constantly run smoothly. Connection errors like HTTP error 408 regularly present websites with minor and major difficulties, especially since the causes are often found on the client side. Our guide looks at the causes...

Reverse ARP

RARP: The Reverse Address Resolution Protocol

Out-dated technology can still be interesting. Even though the Reverse Address Resolution Protocol was introduced in 1984, and considered obsolete the following year due to the Bootstrap Protocol, it continued to be used long after. The RARP has not completely disappeared from network technology even today. As the Reverse ARP, this protocol is a counterpart to the Address Resolution Protocol. But...

550 requested action not taken: possible solutions

SMTP error 550: how to fix “Requested action not taken: mailbox unavailable” and other SMTP 550 error messages

If you want to send a message with your e-mail client and the sending fails, you’ll receive a corresponding error message from the server, including an SMTP status code. For example, the message “550 Requested action not taken: mailbox unavailable” means that the targeted address couldn’t be reached. Since this problem can have various causes, even more possible solutions exist, some of which you...

HTTP 400 Bad Request | finding the causes

HTTP 400: Bad Request explained

Internet users are often confronted with error messages. HTTP status codes can be especially annoying, and even more so if you don’t understand what they mean. The message 'HTTP 400 – Bad Request' is a mystery for many internet users, but luckily it can be solved in most cases. We explain what the error message means and how to fix the error.

504 Gateway Timeout: How to fix it

HTTP 504 (Gateway Timeout): How to fix an error 504

If the error message ‘HTTP 504 Gateway Timeout’ appears when you attempt to open a website, it means that the allowed time for responding to browser queries has been exceeded. A lot of the time the culprit is not the web server itself, but instead some other component of the server, i.e. a gateway, which is integral to the path of communication. What does 504 gateway timeout mean? How can you fix...


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