Web Technician OnlineFree website tools.
Straightforward technical fixes.
Free tools and straightforward fixes for websites, domains, hosting and email.
Search all available tools and guides.
Browse by problem
Useful tools, ready to use
All toolsSMTP error lookup
Understand a three-digit SMTP reply and choose a next check.
Domains & DNS · Live DNS queryDNS lookup
Look up A, AAAA, CNAME, TXT and other public DNS records.
Email · Live DNS queryMX record checker
Find published mail exchangers and their priorities.
Website Errors · Live server checkHTTP status checker
Inspect the first response to a public HTTP(S) URL.
Website Errors · Live server checkRedirect checker
Follow up to five redirects with checks at every destination.
SSL & Security · Live server checkSSL certificate checker
Inspect verified HTTPS trust, hostname, expiry and public certificate details.
Straightforward technical fixes
All guidesHTTP 500: find the server-side failure
Use timing, logs and recent changes to narrow down a server error.
WordPress · GuideWordPress white screen: a careful recovery path
Find a fatal error and recover access while protecting your site and its data.
SSL & Security · GuideSSL certificate errors: check name, date and trust
Write down the browser’s exact error code and hostname.
Domains & DNS · GuideDNS not propagating: verify the authoritative change
Save the previous records and the intended new values.
Email · GuideEmail stopped working after changing nameservers
Locate the previous zone export or screenshots and your email provider’s current instructions.
Email · GuideSMTP 451: diagnose a temporary processing failure
Keep the complete reply, including any enhanced status code, server name and request identifier.
Use the toolbox immediately.
Every tool explains what it checks.
Local tools stay local. Network checks disclose where data goes.