Salesforce LIMIT_EXCEEDED proxy versus origin split response

When this happens

Use this when a cdn, load balancer, reverse proxy, or waf sits in front of the service. Do not stop at the screen message; validate whether the edge/proxy or the origin server creates the failure first.

Symptom checklist

• LIMIT_EXCEEDED appears repeatedly in the Salesforce UI or logs.
• profile, permission set, flow, trigger, owner state differs between successful and failed requests.
• The issue appears only after separating data permission issue from Apex/Flow automation issue.
• It often follows deploys, permission changes, configuration edits, or data refreshes.

Likely causes

• LIMIT_EXCEEDED specifically changes the investigation surface for Salesforce: verify the exact failing object, route, user, and timestamp before applying the broader pattern.
• A validation rule blocks data that automation or import jobs now produce.
• A trigger, Flow, or batch consumes governor limits before the final DML operation.
• The integration user lacks field-level access to the referenced field.
• A field API name differs between sandbox, package, and production.
• Automation order changes the record before validation evaluates.
• For the proxy versus origin split case, the first useful clue is whether the edge/proxy or the origin server creates the failure.

First 1-minute checks

1. Write down the first failure time, latest change, affected user, path, and object ID.
2. Compare profile, permission set, flow, trigger, owner state for success and failure in the same window.
3. Test the hypothesis: Salesforce failure caused by validation rule, governor limit, field-level security, API name drift, or automation order.
4. Classify this as proxy versus origin split: whether the edge/proxy or the origin server creates the failure.
5. Capture current values before changing configuration.

First evidence

Treat LIMIT_EXCEEDED as a proxy versus origin split case. First collect evidence for whether the edge/proxy or the origin server creates the failure.

Output examples

Normal output

Direct origin and routed proxy return equivalent status and headers.

Failing output

Origin succeeds but proxy fails, or proxy succeeds while direct origin exposes the real backend error.

Output-to-action branches

• A CDN, load balancer, reverse proxy, or WAF sits in front of the service.
  Test direct origin and routed traffic separately, then change only the layer that differs.
• The working and failing outputs differ.
  Act on the differing layer first: For LIMIT_EXCEEDED, 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 assume the CDN error code is the application root cause.
• 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 "LIMIT_EXCEEDED" ./logs

sfdx force:user:display

sfdx force:apex:log:list

sfdx force:data:soql:query -q "SELECT Id FROM User LIMIT 1"

grep -R "LIMIT_EXCEEDED" force-app

sfdx force:apex:log:list

sfdx force:data:soql:query -q "SELECT Id, DeveloperName FROM ValidationRule LIMIT 10"

grep -R "FIELD_CUSTOM_VALIDATION_EXCEPTION\|LIMIT_EXCEEDED\|INVALID_FIELD" force-app ./logs

curl -Iv https://example.com --resolve example.com:443:ORIGIN_IP

Fix order

1. Record the full LIMIT_EXCEEDED message, failing URL, user, object ID, and latest change.
2. Collect issue-specific evidence for Salesforce failure caused by validation rule, governor limit, field-level security, API name drift, or automation order.
3. Compare the failing case with a successful case before editing settings.
4. If this is the proxy versus origin split branch, Test direct origin and routed traffic separately, then change only the layer that differs.
5. Re-check with the same command and URL, then record the normal output.

Actions by cause

• For LIMIT_EXCEEDED, apply the fix only after reproducing the same condition and saving the before/after evidence for this exact code.
• Identify the exact rule, field, flow, trigger, and integration user from debug logs.
• Bulkify or split automation when governor limits are exhausted.
• Grant field-level access only to the required profile or permission set.
• Compare metadata names across orgs before changing payloads.
• Add a test record that reproduces the failing validation path.
• For the proxy versus origin split branch, Test direct origin and routed traffic separately, then change only the layer that differs.

Evidence links

• Salesforce Apex developer guide official
• Salesforce CLI command reference official

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 Salesforce LIMIT_EXCEEDED.

Environment-specific checks

• Shared hosting, proxies, VPNs, or CDN layers can change data permission issue from Apex/Flow automation issue results.
• Do not trust only the Salesforce 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 profile, permission set, flow, trigger, owner state.
• Add owner activation, permission sets, validation rules, trigger order to the release checklist.
• Keep recurring errors in the same note format.
• Split alerts by error rate, latency, certificates, disk, and permission changes.

Related notes

• Salesforce INACTIVE_OWNER_OR_USER
• Salesforce INACTIVE_OWNER_OR_USER first triage response
• Salesforce FIELD_CUSTOM_VALIDATION_EXCEPTION first triage response
• Salesforce DUPLICATE_VALUE first triage response
• Salesforce INVALID_CROSS_REFERENCE_KEY first triage response
• Salesforce CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY first triage response
• Salesforce MIXED_DML_OPERATION first triage response
• Salesforce UNABLE_TO_LOCK_ROW first triage response