Server and DNS Health Checks Every Site Owner Should Run Monthly

Most site owners only think about their server when something breaks. The site goes down, email stops arriving, or rankings drop — and only then does anyone look at the infrastructure underneath.

The problem with that approach is that most server and DNS issues degrade gradually. Response times creep upward. An SSL certificate quietly approaches expiry. A redirect chain grows an extra hop after a migration. None of these trigger an alert, and all of them cost you traffic.

This guide gives you a monthly maintenance routine that takes about 20 minutes and catches these problems while they are still cheap to fix.

Check 1: Server Status and Response Codes

Start with the fundamentals: is the server responding, and with the correct status code?

Use a Server Status Checker to test your homepage plus your five most important pages. Every one should return 200 OK.

Also confirm your response time. Time to First Byte above 600ms indicates a server-side bottleneck — typically slow database queries, insufficient PHP workers, or an absent caching layer. Our guide on how to fix slow page speed covers the remediation in detail.

Check 2: DNS Records

DNS is the internet’s address book. When it is wrong, symptoms can be confusing — the site loads fine but email vanishes, or the site works for some visitors and not others.

Pull every record at once with a DNS Records Finder and verify the following.

Records to Verify Monthly

• A record: Points your domain to the server IP. Should match your actual hosting IP. Multiple unexplained A records can indicate a compromise.
• AAAA record: The IPv6 equivalent. Optional, but if present it must point to a working IPv6 address — a stale AAAA record causes intermittent failures for IPv6 users.
• MX records: Route incoming email. Missing or misordered MX records break email delivery entirely.
• NS records: Identify your authoritative name servers. These should match your DNS provider.
• SPF (TXT): Lists servers authorised to send email for your domain. Missing SPF sends your email straight to spam folders.
• DKIM (TXT): Cryptographically signs outgoing email. Required for good deliverability with major providers.
• DMARC (TXT): Tells receiving servers what to do with email failing SPF or DKIM. Also enables reporting on spoofing attempts.
• CNAME records: Alias subdomains to other hostnames. Verify no orphaned CNAMEs point to services you no longer use — these are a subdomain takeover risk.

Cross-check the resolved IP with a Domain into IP lookup to confirm your domain resolves where you expect.

Check 3: Redirect Configuration

Your site should be reachable at exactly one canonical address. Every other variant must redirect there in a single hop.

Test all four combinations:

• http://example.com
• http://www.example.com
• https://example.com
• https://www.example.com

Three of these should 301-redirect directly to the fourth. Use a WWW Redirect Checker to verify each path.

Watch for redirect chains. A common misconfiguration sends http://example.com → https://example.com → https://www.example.com. That works, but it costs an extra round trip on every request and consumes crawl budget unnecessarily. Configure the server to redirect straight to the final destination.

Serving content on multiple variants without redirects creates duplicate content across your entire site — see our guide on duplicate content and SEO for why this splits your link equity.

Check 4: SSL Certificate Status

An expired SSL certificate causes browsers to display a full-page security warning. Traffic stops immediately, and the damage to trust outlasts the outage.

Verify monthly:

• Certificate is valid and not expiring within 30 days
• Certificate covers all variants you serve (including www)
• No mixed content warnings — every asset loads over HTTPS
• The certificate chain is complete (incomplete chains fail on some older clients even when your browser shows no error)

Most hosts auto-renew Let’s Encrypt certificates every 90 days. Auto-renewal does occasionally fail silently, so a calendar reminder set 30 days before expiry is worth the two minutes it takes to create.

Check 5: Blacklist and IP Reputation

On shared hosting, your IP address is shared with other sites. If one of them sends spam or hosts malware, the shared IP can be blacklisted — and your email deliverability suffers for something you did not do.

Run a Blacklist Lookup against both your domain and your server IP monthly. Also run a Suspicious Domain Check to catch malware or phishing flags.

If you find a listing, our guide on how to check if a domain is blacklisted and recover walks through the full removal process.

Confirm your outbound IP with a My IP Address lookup if you are unsure which address to check.

Check 6: Crawlability and Indexation Health

Server health only matters if search engines can act on it. Close the loop each month by confirming:

• Googlebot is not receiving errors — check the Crawl Stats report in Search Console
• Your XML sitemap returns 200 and contains only live, indexable URLs
• robots.txt is accessible and contains no accidental sitewide disallow rules
• Indexed page count has not dropped unexpectedly

Our guide on how to check if Google has indexed your site covers the diagnostic workflow if the numbers look wrong.

The 20-Minute Monthly Routine

1. Server status (3 min). Check homepage plus five key pages for 200 status and response time under 600ms.
2. DNS records (4 min). Pull all records; verify A, MX, NS, SPF, DKIM, DMARC are present and correct.
3. Redirects (3 min). Test all four www/HTTPS combinations; confirm single-hop 301s to the canonical.
4. SSL (2 min). Check expiry date and confirm no mixed content warnings.
5. Blacklist (3 min). Run domain and IP against spam and malware databases.
6. Crawl health (5 min). Review Search Console Crawl Stats, sitemap status, and indexed page count.

Log the results in a simple spreadsheet each month. Trends are more informative than snapshots — a response time climbing from 180ms to 400ms over three months signals a developing problem long before anything actually breaks.

Common Mistakes

• Only checking the homepage. Server errors frequently affect specific templates or sections. Test a representative sample: homepage, a service page, a blog post, and a category archive.
• Assuming DNS is set and forget. Migrations, email provider changes, and CDN additions all modify DNS. Records drift, and stale entries linger.
• Ignoring redirect chains because they still work. They do work — slowly, and at a crawl budget cost that compounds across thousands of URLs.
• Trusting SSL auto-renewal blindly. Auto-renewal usually works. When it fails, it fails silently and you find out from a customer.
• Never checking the server IP on shared hosting. Your domain can be entirely clean while the IP you share is blacklisted.
• Skipping the check after a migration. Migrations are precisely when DNS, redirects, and SSL are most likely to be misconfigured.

Expert Tips

• Set up automated uptime monitoring alongside manual checks. Free services alert you within minutes of an outage. Manual monthly checks catch configuration drift; automated monitoring catches sudden failure. You need both.
• Record baseline response times. Without a baseline you cannot tell whether 400ms is normal for your stack or a regression from 150ms.
• Run the full check immediately after any migration or major plugin change. Do not wait for the next scheduled monthly check.
• Add DMARC reporting even in monitoring-only mode. A DMARC record with p=none costs nothing, breaks nothing, and shows you who is attempting to spoof your domain.
• Check from more than one geographic location. DNS propagation issues and CDN misconfigurations often affect only certain regions.

Monthly Health Check Checklist

• ☐ Homepage and five key pages return 200 OK
• ☐ Server response time under 600ms
• ☐ A record points to the correct server IP
• ☐ MX records present and correctly prioritised
• ☐ SPF, DKIM, and DMARC records configured
• ☐ NS records match your DNS provider
• ☐ No orphaned CNAME records pointing to unused services
• ☐ All four www/HTTPS variants redirect to the canonical in one hop
• ☐ No redirect chains longer than a single hop
• ☐ SSL certificate valid, not expiring within 30 days
• ☐ No mixed content warnings on HTTPS pages
• ☐ Domain and server IP clear on blacklist databases
• ☐ Search Console Crawl Stats show no error spike
• ☐ XML sitemap returns 200 and lists only live URLs
• ☐ Indexed page count stable or growing
• ☐ Results logged for month-over-month comparison

Frequently Asked Questions

How often should I check server health?

Run a full manual health check monthly, covering server status, DNS records, redirects, and SSL expiry. Alongside that, set up automated uptime monitoring that alerts you within minutes of an outage. Monthly checks catch slow-developing configuration issues; automated monitoring catches sudden failures.

What HTTP status code should my homepage return?

Your homepage should return 200 OK. A 301 is acceptable only as a canonical redirect step, such as HTTP to HTTPS or non-www to www. Any 4xx or 5xx status on the homepage is an emergency requiring immediate attention.

What DNS records does a website need?

At minimum: an A record pointing the domain to the server IP, NS records identifying the authoritative name servers, and MX records if the domain receives email. Sites sending email also need SPF, DKIM, and DMARC TXT records for authentication and deliverability.

Should I use www or non-www?

Either works for SEO — what matters is picking one and redirecting the other with a 301. Serving both without a redirect creates duplicate content across every URL on your site and splits link equity between two versions of the same page.

What is a good server response time?

Aim for Time to First Byte under 200ms, and treat anything above 600ms as a problem worth investigating. Slow server response delays every downstream metric including Largest Contentful Paint, and causes Googlebot to reduce crawl frequency.

How do I check if my SSL certificate is about to expire?

Click the padlock icon in your browser’s address bar and view the certificate details, which include the expiry date. Most hosts auto-renew Let’s Encrypt certificates, but auto-renewal can silently fail. Add the expiry date to your calendar with a 30-day reminder as a safeguard.

What is a redirect chain and why does it matter?

A redirect chain occurs when URL A redirects to B, which redirects to C. Each hop adds latency for users and consumes crawl budget. Some link equity is also lost across multiple hops. Always redirect directly to the final destination in a single step.

Does server location affect SEO?

Indirectly. Server location affects latency for users in different regions, and page speed is a ranking factor. A CDN largely neutralises this by serving cached content from edge locations near the user. Server location is not itself a direct ranking signal.

Conclusion

Server and DNS problems rarely announce themselves. They accumulate quietly — a slower response here, a stale DNS record there, a redirect chain added during a migration — until something visible finally breaks and the fix is far more expensive than prevention would have been.

Twenty minutes a month is a small investment against downtime, lost email, and crawl budget waste. Put a recurring reminder in your calendar, run the checklist above, and log the results so you can see trends rather than isolated snapshots.

If you would rather have this handled as part of an ongoing technical SEO programme, EW Marketings offers monthly monitoring covering server health, DNS, crawlability, and indexation. Request a free consultation to discuss what your site needs.