Automation
SSL certificate monitoring with Python: verify what F5 and A10 actually serve
Check certificate expiry and trust at each VIP using the correct TLS hostname, then turn renewal warnings into actionable monitoring.
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Technical notes and experiences from the field. On application delivery, security and open source.
Automation
A10 aXAPI with Python: inventory virtual servers without changing configuration
Authenticate safely, retrieve virtual-server configuration and close the session, with TLS verification and explicit error handling.
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A10 Thunder TPS and A10 Defend: designing DDoS protection for availability
Connect detection, traffic steering, mitigation and recovery in a DDoS design that measures the availability of legitimate services.
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A10 load balancer configuration: virtual servers, service-groups and source NAT
Understand the ACOS object chain and the relationship between backend services, virtual ports, health checks and return-path design.
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F5 HTTP to HTTPS redirect: iRules, status codes and redirect loops
Build a controlled HTTP redirect, preserve the request URI, choose the appropriate status code and investigate loops across the proxy chain.
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F5 pool member down: troubleshooting health monitors
Compare monitor probes with application requests, inspect pool status and configuration, and investigate HTTP responses and network paths.
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F5 SSL handshake failure: troubleshooting TLS systematically
Separate client-side and server-side TLS, test SNI and certificate trust, and locate the failing connection with OpenSSL and curl.
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A Custom F5 APM logon page
A custom F5 APM logon page with dynamic OTP and push authentication.
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Solo V2 — Solokeys U2F Security Key
A look at the new hardware revision of the opensource FIDO2 security key.
Read articleMail — Postfix — Postscreen how to
Blocking spam and reducing mail-server load with Postscreen.
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Palo Alto Traffic log — Incomplete or Insufficient data
A closer look at the application field in Palo Alto traffic logs.
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Data Guard with F5 ASM
Working with Data Guard in F5 ASM.
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