Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CCrawlabilityActionrobots.txt present, sitemap with 0 URLsREVIEW
Search engines may not be able to parse the sitemap. Fix XML validation errors.
An unparseable sitemap is silently ignored by Google — the URLs it advertises are never queued for crawl.
Learn more ▾ ▴
Google's sitemap parser is strict about XML validity. A single unescaped `&` or unclosed tag invalidates the whole file. Run your sitemap through a validator (Search Console's Sitemaps report flags it) and fix the offending entry. Most generators escape correctly; mistakes usually come from manually-written entries.
Source: sitemaps.org / Google Search Central
An empty sitemap provides no value. Add <url> entries for your pages.
An empty sitemap signals 'no content to index' to Google — actively harmful versus having no sitemap at all.
Learn more ▾ ▴
Google compares URLs in the sitemap against URLs it has crawled. An empty sitemap on a site with thousands of pages signals abandonment. Either populate it correctly (most CMSes auto-generate) or delete the file and let Google crawl normally.
Source: Google Search Central / sitemaps.org
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
# robots.txt for www.uni-stuttgart.de
#
# Mon Jan 27 15:50:28 MEZ 1997 by Heron
#
User-agent: *
Disallow: /verf/downloads/Vertiefung_BiomedVerfahrenstechnik_2016_Doser.pdf
Disallow: /linguistik/sfb732/*
Disallow: /.content/*
Disallow: /.uni/*
Disallow: /click
Disallow: /suggest
Disallow: /cluster
Disallow: /common.js
Disallow: /xmlhttp.js
Disallow: /uri.js
Disallow: /cluster.js
Disallow: /ss.js
Disallow: /handbuch-zv-2017/*
Disallow: /About/Wie_Homepage.html
Disallow: /cgi-bin/
Disallow: /print
Disallow: /redirect
Disallow: /search
Disallow: /stuttgart/stadtplan/map.pl
Disallow: /stuttgart/stadtplan/suche.pl
Disallow: /ochem/36/ba/04GUEG.html
Disallow: /imi/download/*
Disallow: /hilaritas/*
Disallow: /pfaffenhof/*
Disallow: /*/.stats
Disallow: /reisekosten/
Disallow: /aegee/
Disallow: /zertifikate/
Disallow: /akmodell/showit
Disallow: /infotech/serv
Disallow: /universitaet/fueralle/schuelerforschungscampus/tag-der-wissenschaft/anmeldung/*
# Bilder nicht indexieren lassen
#Disallow: /*.gif$
#Disallow: /*.jpg$
#Disallow: /*.png$
#Disallow: /*.jpeg$
# aber Resourcen unter /res/ trotzdem indexieren
#Allow: /res/*
Disallow: /germed/news/docs/Prueferzuteilung_Staatsexamen_Fruehjahr_2015_NEU.xlsx
Disallow: /germed/lehre/veranstaltungen/docs/Prueferzuteilung_Staatsexamen_Herbst_2014.xlsx
Disallow: /phpmyadmin/*
Disallow: /*/xmlrpc.php
Disallow: /*?calYear=*
Disallow: /antidiskriminierung
Disallow: /universitaet/aktuelles/meldungen/fragen-und-antworten-zum-forschungsneubau-lcrl/*
Disallow: /en/university/news/all/questions-and-answers-on-the-new-lcrl-research-building-/*
Disallow: /universitaet/aktuelles/meldungen/Nachhaltiges-Bauen-mit-dem-Large-Scale-Robotics-Laboratory-LCRL/*
Disallow: /en/university/news/all/Sustainable-construction-with-the-Large-Scale-Robotics-Laboratory-LCRL/*
Disallow: /studium/bachelor/stories/*
#User-agent: Googlebot-Image
#Disallow: /
User-agent: Xenu Link Sleuth
Allow: /
User-agent: Yandex
Disallow: /
User-agent: ICCrawler - iCjobs
Disallow: /
User-agent: Web Downloader/3.0
Disallow: /
User-agent: MJ12bot
Disallow: /
User-agent: AhrefsBot
Disallow: /
#
CURL VariantsActionwww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Use 301 (permanent) instead of 302 (temporary)
BTLS Certificate Expiry & Recommendations202 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Add includeSubDomains to the HSTS directive
- Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+DNS Records1 A records, 46 ms lookupPASS
| A | 129.69.0.47 |
| AAAA | 2001:7c0:2041:48::47 |
| CNAME | — |
| NS | dns-auth2.uni-stuttgart.edu, dns-auth3.uni-stuttgart.net, dns-auth1.uni-stuttgart.de |
| MX | 10 mxex2.tik.uni-stuttgart.de 10 mxex1.tik.uni-stuttgart.de |
| TXT | google-site-verification=H44ewdpwEWItGRRimCVxcR_ecOlVXvOgXeKE9RgM2ts adobe-idp-site-verification=89e0898d92cb1af1264a5095a1ec46b6c591d4af17b8881af3e8... University of Stuttgart security_contact=noc@uni-stuttgart.de SPF v=spf1 include:_spf.mxex.uni-stuttgart.de include:_spf.mailrelay.uni-stuttgart.d... MS=D72A25682508B3822D00441FBB6C7A2A083F0400 |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
ARedirect Chain1 redirect(s), 223 ms totalPASS
https://uni-stuttgart.de
93 ms · HTTP/1.1
https://www.uni-stuttgart.de
130 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://uni-stuttgart.de | 302 | 93 ms | HTTP/1.1 | gunicorn |
| 2 | https://www.uni-stuttgart.de | 200 | 130 ms | HTTP/1.1 | OpenCms/20.0.18 |
See the visual redirect chain in the HTTP Probe tab →
If permanent, use 301 instead.
302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.
Learn more ▾ ▴
Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).
Source: Google Search Central
A+IPv6 ReadinessIPv6 reachable (28 ms)PASS
A+Domain Intelligenceuni-stuttgart.dePASS
Unknown
202 days
Issued by Hellenic Academic and Research Institutions CA
Unknown
Status unknown
Protects against DNS spoofing
Unknown
2001:7c0:2041:48::47
Registrar unknown
Expiry timeline
Recommended actions
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice