Server Diagnostics
Open Server Diagnostics in the left sidebar between Plugins and Hash & Checksum. Enter a hostname, IPv4, IPv6 or URL and select Auto / IPv4 / IPv6 / Both. Start an overview or an individual tool; measurements can be stopped.
Tools include ICMP graphs, progressive traceroute, 12 DNS record types, HTTP protocol comparisons and request timings, compression verification, TLS 1.2/1.3, TCP ports, an SSH handshake without authentication and a WebSocket handshake.
HTTP/1.1, HTTP/2 and HTTP/3 use the bundled client with TLS verification. A completed QUIC transfer on the target HTTPS port confirms HTTP/3. Alt-Svc is only an advertisement; a UDP timeout leaves support unverified. DNSSEC is not validated and ICMP loss does not establish server unavailability.
History stays local. JSON/CSV/TXT exports omit response bodies, cookies, authentication data and URL queries. Saved runs can be imported, reopened and compared.