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TLS COMMON_NAME_INVALID timeout and load response

A TLS timeout and load note for COMMON_NAME_INVALID: TLS or certificate failure caused by hostname mismatch, expired chain, protocol policy, SNI, or mixed content. It includes evidence, output examples, branches, and the smallest reliable fix.

mediumCOMMON_NAME_INVALID8 min read
First command
grep -R "COMMON_NAME_INVALID" ./logs
First evidence

Treat COMMON_NAME_INVALID as a timeout and load case. First collect evidence for latency, worker saturation, connection pools, locks, and long-running jobs.

Search queries
TLS COMMON_NAME_INVALIDSSL error COMMON_NAME_INVALIDTLS COMMON_NAME_INVALID timeout and load response

When this happens

Use this when the issue appears during traffic spikes, exports, batch jobs, or slow queries. Do not stop at the screen message; validate latency, worker saturation, connection pools, locks, and long-running jobs first.

Symptom checklist

  • COMMON_NAME_INVALID appears repeatedly in the TLS UI or logs.
  • certificate chain, SNI, expiry, TLS version differs between successful and failed requests.
  • The issue appears only after separating browser errors from openssl handshake output.
  • It often follows deploys, permission changes, configuration edits, or data refreshes.

Likely causes

  • COMMON_NAME_INVALID specifically changes the investigation surface for SSL: verify the exact failing object, route, user, and timestamp before applying the broader pattern.
  • The certificate chain, hostname, SNI, or TLS policy does not match the request.
  • A proxy or load balancer terminates TLS with a different certificate than the origin.
  • Browsers may cache HSTS or mixed-content decisions after the server is fixed.
  • The visible browser error hides whether the failure is certificate, protocol, or content policy.
  • A renewal completed in the panel but the web server still serves the previous certificate.
  • For the timeout and load case, the first useful clue is latency, worker saturation, connection pools, locks, and long-running jobs.

First 1-minute checks

  1. Write down the first failure time, latest change, affected user, path, and object ID.
  2. Compare certificate chain, SNI, expiry, TLS version for success and failure in the same window.
  3. Test the hypothesis: TLS or certificate failure caused by hostname mismatch, expired chain, protocol policy, SNI, or mixed content.
  4. Classify this as timeout and load: latency, worker saturation, connection pools, locks, and long-running jobs.
  5. Capture current values before changing configuration.

First evidence

Treat COMMON_NAME_INVALID as a timeout and load case. First collect evidence for latency, worker saturation, connection pools, locks, and long-running jobs.

Output examples

Normal output

Connect, first byte, and total time stay within the expected budget.

Failing output

Connect time, first byte time, or total time spikes before the error.

Output-to-action branches

  • The issue appears during traffic spikes, exports, batch jobs, or slow queries.
    Find whether the delay is network connection, upstream processing, database lock, or worker exhaustion.
  • The working and failing outputs differ.
    Act on the differing layer first: For COMMON_NAME_INVALID, apply the fix only after reproducing the same condition and saving the before/after evidence for this exact code.
  • Command output is normal but users still fail.
    Separate browser cache, cookies, permissions, and network location before declaring it fixed.

Do not do this

  • Do not only raise timeouts while the synchronous workload remains unchanged.
  • Do not change multiple layers before identifying the failing layer.
  • Do not delete production data, grant broad permissions, or disable security controls as a first response.

Evidence quality

Auto-generated operator draft: includes issue-specific causes, commands, output branches, and unsafe-action warnings. Official-source links and real incident validation are queued for enrichment.

Commands to run first

grep -R "COMMON_NAME_INVALID" ./logs
openssl s_client -connect example.com:443 -servername example.com -showcerts
curl -Iv https://example.com
nmap --script ssl-enum-ciphers -p 443 example.com
date -u
openssl s_client -connect example.com:443 -servername example.com -showcerts
curl -Iv https://example.com
nmap --script ssl-enum-ciphers -p 443 example.com
curl -w 'connect=%{time_connect} start=%{time_starttransfer} total=%{time_total}\n' -o /dev/null -s https://example.com

Fix order

  1. Record the full COMMON_NAME_INVALID message, failing URL, user, object ID, and latest change.
  2. Collect issue-specific evidence for TLS or certificate failure caused by hostname mismatch, expired chain, protocol policy, SNI, or mixed content.
  3. Compare the failing case with a successful case before editing settings.
  4. If this is the timeout and load branch, Find whether the delay is network connection, upstream processing, database lock, or worker exhaustion.
  5. Re-check with the same command and URL, then record the normal output.

Actions by cause

  • For COMMON_NAME_INVALID, apply the fix only after reproducing the same condition and saving the before/after evidence for this exact code.
  • Inspect the returned certificate with SNI before editing DNS.
  • Install the full chain and reload the web server or load balancer.
  • Align TLS mode, cipher policy, and origin certificate policy.
  • Replace insecure embedded assets when the issue is mixed content.
  • Clear HSTS or browser cache only after confirming the server response is corrected.
  • For the timeout and load branch, Find whether the delay is network connection, upstream processing, database lock, or worker exhaustion.

Verification metadata

  • operator-draft
  • official-reference-linked
  • 2026-07-23

Update queue

  • Review cadence
    weekly-source-review
  • Next enrichment
    Add one official-source check and one real output example for SSL COMMON_NAME_INVALID.

Environment-specific checks

  • Shared hosting, proxies, VPNs, or CDN layers can change browser errors from openssl handshake output results.
  • Do not trust only the TLS UI; compare command output.
  • Japanese hosting panels may show completion before DNS or SSL fully propagates.
  • Test from both office and external networks.

Prevent it next time

  • Store normal examples for certificate chain, SNI, expiry, TLS version.
  • Add fullchain install, SNI vhost, and TLS 1.2+ settings to the release checklist.
  • Keep recurring errors in the same note format.
  • Split alerts by error rate, latency, certificates, disk, and permission changes.