DynDNS.com - Support -- Knowledge Base

Why can't I connect to my server? — Our comprehensive troubleshooting guide
Why is my host blocked for abuse? — Information on abusive updates and how to prevent them
Routers and Port Forwarding — One of the most common connection errors
Loopback Connections — When internal access isn't working
DNS Caching — How records are stored in DNS and how to clear them

Dynamic DNS Overview — Guide for our free DNS service
What is DNS? — Information about the Domain Name System
How Dynamic DNS Works — Detailed article on our DDNS update protocols

Custom DNS Overview — Guide to our flagship DNS service for your own domain name
Changing DNS Providers Without Downtime — Painlessly switch from another provider
Why Custom DNS? — The benefits of using Custom DNS
Custom/Secondary DNS Conversion — How to convert seamlessly between Custom and Secondary DNS
Zone Activation — Information on zone activation and automatically preactivated ccTLDs
.de Domains in Custom DNS — Caveats and issues with .de domains
Record Types in Expert Interface — A list of available DNS records in Expert mode
Record Types in Standard Interface — A list of available DNS records in Standard mode
Using Google Apps with Custom DNS — Tutorial on configuring Google Apps with your service

Secondary DNS Overview — Our secondary service for your own primary nameserver
Running a Hidden Primary — Keep your primary nameserver out of the delegation
Decrementing your zone serial — How to reset your zone serial
Windows Server 2008 and Secondary DNS — Brief tutorial for Windows Server 2008

Types of Hosting — Overview of different hosting methods from DIY to dedicated colocation
Using Custom DNS with Subdomains — How to delegate a single subdomain
Reverse DNS — Guide to reverse DNS delegation
Recursive DNS — Overview of Recursive DNS
Monitoring Best Practices — Guide on maintaining a healthy network
Implementing DNSSEC — Detailed tutorial for digitally signing your zones
IPv6 with Custom and Secondary DNS — Add an IPv6-enabled nameserver to your delegation

MailHop Relay — Our service for receiving mail on alternate ports
MailHop Forward — Mail redelivery to mailboxes hosted elsewhere
MailHop Backup MX — Queuing mail during downtime
MailHop Outbound — Outgoing SMTP relay

E-mail, Mail Exchangers and DNS — Overview of e-mail and DNS
Getting E-mail with Custom DNS — How to configure your domain's DNS to receive mail
SPF and DynDNS.com Systems/Services — Information on SPF records

Using MailHop Services with Firewalls — Our MailHop server IP addresses for use with whitelists and firewalls
MailHop Message Filtering — An overview of our anti-spam services
Things Not to Do with MailHop Backup MX — Avoiding greylisting, tarpitting and other problems
MailHop Services and Cisco Firewalls — How to fix delivery problems when using Cisco firewalls


MailHop and Postini — Why you can't use third-party spam scanning with MailHop
Comcast and MailHop Forward — Why we automatically enable spam scanning for Comcast addresses

Domain Registration Overview — General information and FAQ
What is a Domain Registration? — In-depth explanation of domain registrations
Domain Expirations — The end-of-life cycle of a domain registration

Domain Transfers — Pre-transfer checklist and tutorial
Trouble With Transfers — Common problems and solutions for domain transfers
Domain Transfer Guides — Tutorials for preparing a domain for transfer

Domain Hijacking — Tips to avoid stolen domain registrations
Domain Scams — Information on predatory registrars
Domain Scams Redux — Update on predatory registrars

XAMPP and Apache Quick Guide — Fast tutorial for XAMPP web/FTP/MySQL/PHP suite
Dynamic DNS, Apache and Windows — Quick guide for using Dynamic DNS with Apache
Virtual Hosting with Apache — Hosting multiple websites from a single server
Virtual Hosting with IIS — Hosting multiple websites from a single server
WebHops and Redirections — Guide for choosing the proper type of redirect

Wordpress Quick Guide — Fast tutorial for installing Wordpress blogging software
Simple Picture Gallery Manager Quick Guide — Fast tutorial for installing SPGM image gallery script

Using OpenVPN With DynDNS — Quick guide to installing and using OpenVPN
TightVNC Quick Guide — Brief tutorial for installing and using TightVNC

Generating CSRs — Tutorials for many common webservers
Preventing CSR Errors — Avoiding invalid CSRs
SSL Certificate Installation Instructions — How to install your finished SSL cert

Spring Server Basics for Ubuntu/Debian — Quick guide for Debian installations
iptables and Spring Server VPS — Default firewall rules for Spring Server instances
Quake III How-to — Guide to running Quake III over IPv6

Software Clients — Windows, Mac OSX, and Unix
Hardware Clients — Certified device-embedded update clients
Why We Recommend Software Clients — The pros and cons of using hardware-based clients

DynDNS Updater for Windows — Tutorial for installing the Windows version of our official client
DynDNS Updater for Mac OSX — Tutorial for installing the Mac version of our official client
Using ddclient with DynDNS.com Services — Guide to configuring ddclient for Unix
Using inadyn with DynDNS.com Services — Guide to configuring inadyn for any OS

Using the DynDNS Updater with VPNs — Prevent your client from retrieving remote IP addresses
Configuring Cisco Routers with HTTPS — Guide for setting up Cisco devices for secure updates
Dynamic DNS Updates and TSIG — Secure update protocol for advanced users
Developers' Connection — Information on update client authoring and our update protocols