Application Gateway | Top 5 CSS Issues updates to migrated docs

[mbender-ms]

Summary

Fact-check and edit Application Gateway troubleshooting docs based on customer feedback report and top CSS issues.

Changes (14 edits across 5 files)

http-response-codes.md (7 changes)

• Fixed 303 response code description (was incorrectly referencing 302)
• Fixed 'storage blog' typo to 'storage blob' and grammar correction
• Added missing 503 Service Unavailable section with causes and troubleshooting
• Added TLS handshake failure note covering TLS 1.0/1.1 deprecation (Aug 2025)
• Added WAF false positive troubleshooting steps to 403 section (5-step remediation)
• Updated ms.date

log-analytics.md (2 changes)

• Fixed 'WAK SKU' typo to 'WAF SKU'
• Updated ms.date

create-gateway-internal-load-balancer-app-service-environment.md (2 changes)

• Fixed ms.service from azure-vpn-gateway to azure-application-gateway
• Updated ms.date

application-gateway-key-vault-common-errors.md (1 change)

• Updated ms.date (was 3.5 years stale)

ingress-controller-troubleshoot.md (2 changes)

• Fixed Kubernetes Ingress YAML for networking.k8s.io/v1 format
• Updated ms.date

CSS Issue Coverage

Issue	Coverage
Frequent 5xx errors (502/503)	502 article + new 503 section + backend health article
SSL/TLS certificate setup issues	Key Vault errors + mutual auth + backend health + new TLS handshake note
WAF false positives blocking traffic	New 403 troubleshooting steps + log-analytics WAF queries

AB#552416

[prmerger-automator]

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[learn-build-service-prod]

Learn Build status updates of commit 97a3382:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
support/azure/application-gateway/ts-updates-03052026.md	⚠️Warning		Details
support/azure/application-gateway/application-gateway-key-vault-common-errors.md	✅Succeeded
support/azure/application-gateway/create-gateway-internal-load-balancer-app-service-environment.md	✅Succeeded
support/azure/application-gateway/http-response-codes.md	✅Succeeded
support/azure/application-gateway/ingress-controller-troubleshoot.md	✅Succeeded
support/azure/application-gateway/log-analytics.md	✅Succeeded

support/azure/application-gateway/ts-updates-03052026.md

• Line 1, Column 1: [Warning: title-missing - See documentation] Missing required attribute: 'title'. Add a title string to show in search engine results.
• Line 1, Column 1: [Suggestion: ms-date-missing - See documentation] Missing required attribute: 'ms.date'.
• Line 1, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.
• Line 1, Column 1: [Suggestion: ms-service-suggested] Missing required attribute: 'ms.service'. ms.service is suggested for each article that is published on Learn.
• Line 51, Column 48: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/application-gateway/http-response-codes' will be broken in isolated environments. Replace with a relative link.
• Line 52, Column 44: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/application-gateway/custom-error' will be broken in isolated environments. Replace with a relative link.
• Line 53, Column 36: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/troubleshoot/azure/application-gateway/application-gateway-backend-health-troubleshooting' will be broken in isolated environments. Replace with a relative link.
• Line 54, Column 38: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/web-application-firewall/ag/ag-overview' will be broken in isolated environments. Replace with a relative link.
• Line 56, Column 41: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/storage/common/storage-network-security' will be broken in isolated environments. Replace with a relative link.
• Line 57, Column 45: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/application-gateway/application-gateway-ssl-policy-overview' will be broken in isolated environments. Replace with a relative link.
• Line 58, Column 53: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/application-gateway/application-gateway-configure-ssl-policy-powershell' will be broken in isolated environments. Replace with a relative link.
• Line 59, Column 46: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/web-application-firewall/ag/web-application-firewall-troubleshoot' will be broken in isolated environments. Replace with a relative link.
• Line 60, Column 25: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/web-application-firewall/ag/application-gateway-waf-configuration' will be broken in isolated environments. Replace with a relative link.
• Line 61, Column 48: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/web-application-firewall/ag/best-practices' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

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[learn-build-service-prod]

Learn Build status updates of commit 7c60853:

✅ Validation status: passed

File	Status	Preview URL	Details
support/azure/application-gateway/application-gateway-key-vault-common-errors.md	✅Succeeded
support/azure/application-gateway/create-gateway-internal-load-balancer-app-service-environment.md	✅Succeeded
support/azure/application-gateway/http-response-codes.md	✅Succeeded
support/azure/application-gateway/ingress-controller-troubleshoot.md	✅Succeeded
support/azure/application-gateway/log-analytics.md	✅Succeeded

For more details, please refer to the build report.