Here is a list of some of my favorite system administration tools on the web.
- DNS tools, reports and Hosting tests, advanced network and domain name tools.
- This is the best site for web based DNS troubleshooting tools. It's worth paying for.
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- Network Utilities - Web NSLookup
- Really nice web nslookup.
- When you need help figuring out how much usable space you will get after the RAID.
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SMTP Error Codes - Enhanced Mail System Status Codes RFC
- Need to troubleshoot an smtp mail failure and all you have is the error code? This is the place to look them up. The official document.
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- Set of free web dns tools such as blacklist checker, portscan, test email address for validity, dns lookup.
- These instructions walk you through testing SMTP connections manually by telneting from your server to the other server on port 25 (SMTP) and sending an email manually. Useful for testing when you need to troubleshoot whether a problem is network connectivity or other issue.
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