Browsers aggressively cache DNS answers and static assets. After DNS or SSL moves at HostStack, clear browser caches or test inside incognito before concluding propagation failed.
DNS propagation is incremental TTL expiry worldwide — not a single flip switch. Use external DNS propagation checkers with mixed vantage points.
Combine traceroutes/MTR sparingly — ICMP shaping differs across carriers without implying HTTP outages.