A webhook arrives but your handler rejects it. The JSON might have escaped quotes, wrong types, or missing keys. Debug it with jq, Python, and OpsCheck.
Your access logs are full of non-human traffic. Learn to classify it into search crawlers, security scanners, content scrapers, and real visitors.
A weird User-Agent string in your logs does not always mean an attack. Separate real scanners, broken clients, bots, and actual threats.
Behind a CDN or reverse proxy, original client IPs and cache status get buried in headers. Decode X-Forwarded-For, CF-Connecting-IP, and cache layers.
You deployed a fix but users report seeing the old version. Cache-Control headers, CDN caching, and browser back-forward cache are the usual suspects.
An HTTP redirect loop can come from your app, a reverse proxy, a CDN, or HSTS policy. Trace each hop and identify the exact redirect source.
An unknown MAC address appears in your DHCP leases or ARP table. Use OUI lookup, port mapping, and traffic patterns to identify it fast.
After moving a server or acquiring a new IP block, geolocation databases may show the wrong country for months. Understand the update cadence.
An IP address appearing in your logs does not mean it belongs to who you think. Verify ASN ownership, BGP announcements, and real network operators.
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