The following recommended links are hand-picked to help our customers configure, optimize, test, and secure their network resources.
DNS
- whatsmydns.net – whatsmydns.net is an online service that allows you to instantly perform a DNS lookup to check a hostnames current IP Address and other DNS information against a selection of random name servers around the world. This is especially useful to check the current state of DNS propagation after making changes to your domains zones.
- DNSInspect – DNSInspect is a free web tool which checks your domain's servers for common DNS and mail errors and generates a report with explanations how to fix them.
- Pingdom Tools DNS Check – The DNS Check in Pingdom Tools will check your DNS health and help you find errors, and verify that you domain name has been set up correctly. The DNS check will automatically find out which DNS servers are used by the domain name you specify, then perform a number of tests on them to make sure that the domain name is properly set up and that those DNS servers are responding in a consistent and correct manner.
- MXToolBox – This test will list MX records for a domain in priority order. The MX lookup is done directly against the domain's authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check and measure response time performance. You may also check each MX record (IP Address) against 105 DNS based blacklists (commonly called RBLs, DNSBLs).
- Port25 DKIM Wizard – This wizard will allow you to easily create a public and private key pair to be used for DomainKeys and DKIM signing within PowerMTA. The key pair will be used for both DomainKeys and DKIM signing.
- DMARC FAQ – DMARC is a way to make it easier for email senders and receivers to determine whether or not a given message is legitimately from the sender, and what to do if it isn't. This makes it easier to identify spam and phishing messages, and keep them out of peoples' inboxes.
General Security
- Qualys SSL Labs SSL Server Test – This free online service performs a deep analysis of the configuration of any SSL web server on the public Internet.
- Block SSH Brute Force Attacks with IPTables – Great article on using IPTables to thwart brute force attacks on SSH.
- Securing Remote Desktop for System Administrators – Excellent article on securing Microsoft Windows RDP services.