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.
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations321 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, 43 ms lookupPASS
| A | 139.18.16.133 |
| AAAA | — |
| CNAME | — |
| NS | dns-3.dfn.de, dns-extern-slave.uni-jena.de, news.uni-leipzig.de, server2.rz.uni-leipzig.de |
| MX | 10 v1.rz.uni-leipzig.de 10 v3.rz.uni-leipzig.de 10 v2.rz.uni-leipzig.de 50 v4.rz.uni-leipzig.de |
| TXT | HARICA-zdl63Rm7kPlRzvf2vVw adobe-idp-site-verification=be831e81aa48f6cb9636c39341fd6e2672bb96beef2de133c118... SPF v=spf1 mx ip4:141.39.224.245 ip4:139.18.1.193 ip4:139.18.1.194 ip4:139.18.1.195 ... MS=ms73591495 apple-domain-verification=upbDuA3ynJZDY1c9 HARICA-4gyABm4VUEDJ9MKihAv _telesec-domain-validation=348537_2026-02-03_Pz7OHhIkqqUNbcupfWoB7brpy5CM26ThPO2... _telesec-domain-validation=320938_2024-04-08_jCUBmFRu0fAxAj8le26XcbFs9GxllCFaaIR... |
| 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), 390 ms totalPASS
https://uni-leipzig.de
167 ms · HTTP/1.1
https://www.uni-leipzig.de/
223 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://uni-leipzig.de | 301 | 167 ms | HTTP/1.1 | |
| 2 | https://www.uni-leipzig.de/ | 200 | 223 ms | HTTP/1.1 | nginx |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 2 URLsPASS
# Sitemap
Sitemap: https://www.uni-leipzig.de/sitemap.xml
###Grunsätzliche Erlaubnis für alle Verzeichnisse/Ordner/Pfade
# beinhaltet auch Seitenstruktur im Frontend
User-agent: *
Allow: /
# TYPO3-Pfade ausschließen
Disallow: /typo3_src/
Disallow: /typo3/
Disallow: /t3lib/
Disallow: /typo3conf/
Disallow: /suche
Disallow: /en/search
# Speicher und Uploadpfade ausschließen
Disallow: /typo3temp/
Disallow: /uploads/
Disallow: /fileadmin/prins_import/
# Dateien nach Endung ausschließen (php, Typoscript, ...)
Disallow: /*.php
Disallow: /*.tss
Disallow: /*.tsc
Disallow: /*.csv
Disallow: /*.xls
Disallow: /*.xlsx
# Ausschließen, dass Seiten ohne sprechende URL indiziert werden (duplicate content!)
Disallow: /*?id=*
Disallow: /*?type=98*
Disallow: /feedback
Disallow: */feedback*
Disallow: /?contentid=*
# Zugriff auf die Extension und TMPFiles, welche die CSS und JS Dateien beinhalten, erlauben
#(Google MobileFriendlyTest - Sichtbarkeit Styles + Scripts: https://www.google.com/webmasters/tools/mobile-friendly/).
Allow: /typo3conf/ext/*/Resources/Public/
Allow: /*.js
Allow: /*.js.*
Allow: /*.css
Allow: /*.css.*
Allow: /*.jpg
Allow: /*.jpeg
Allow: /*.svg
Allow: /*.gif
Allow: /*.png
### in typo3temp und uploads explizit freigeben da der Ordner an sich verboten ist
Allow: /typo3temp/*.jpg
Allow: /typo3temp/*.png
Allow: /typo3temp/*.gif
Allow: /typo3temp/*.svg
Allow: /typo3temp/*.js
Allow: /typo3temp/*.css
Allow: /typo3temp/*.js.*
Allow: /typo3temp/*.css.*
Allow: /uploads/*.jpg
Allow: /uploads/*.png
Allow: /uploads/*.gif
Allow: /uploads/*.svg
Allow: /uploads/*.js
Allow: /uploads/*.css
Allow: /uploads/*.js.*
Allow: /uploads/*.css.*
# falls die Wartungsseite in wartung liegt
Disallow: /wartung/
A+Domain Intelligenceuni-leipzig.de — hosted on DFN Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DEPASS
Unknown
321 days
Issued by Hellenic Academic and Research Institutions CA
Unknown
Status unknown
Protects against DNS spoofing
DFN Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE
ASN AS680
139.18.16.133
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