Infrastructure - https://eso.org BeaverCheck Audit

D

CDN & Delivery

Action

No CDN detected

FIX

No CDN detected

A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.

No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

B

Redirect Chain

1 redirect(s), 2656 ms total

REVIEW

1 redirect(s), 2656 ms total

Single redirect

Got: https://eso.org → https://www.eso.org/public/ (302)

WWW normalization redirect

Uses 302 (temporary) redirect

If permanent, use 301 instead.

Got: https://eso.org

Redirect overhead: 2656 ms total

Got: 2656 ms

https://eso.org

708 ms · HTTP/1.1

302

https://www.eso.org/public/

1948 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://eso.org	302	708 ms	HTTP/1.1	nginx/1.20.1
2	https://www.eso.org/public/	200	1948 ms	HTTP/1.1	nginx/1.20.1

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

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

C

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

No IPv6 (AAAA) records found

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

No IPv6 Support

About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

B

Crawlability

robots.txt present, no sitemap

REVIEW

robots.txt present, no sitemap

robots.txt is present

Got: 2277 bytes

No sitemap.xml found

A sitemap helps search engines discover and index your pages more efficiently.

robots.txt does not reference a sitemap

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.

Learn more ▾

A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.

Source: sitemaps.org / Google Search Central

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK

Size 2277 B Sitemaps referenced 0 User-agents *, WebCopier, puf Blocking No — crawling allowed

# $Id: robots.txt,v 1.19 2017/05/23 17:35:51 web Exp web $
# robots.txt for http://www.eso.org/

User-agent: *

# CQ start
Disallow: /libs
Disallow: /apps
# CQ end
Disallow: /sci/php/redirect.html
Disallow: /public/redirect.html
Disallow: /intra/redirect.html
Disallow: /images/staff
Disallow: /sci/activities/projects/eis/bin
Disallow: /secure
Disallow: /casalma
Disallow: /almaaqua
Disallow: /wiki
Disallow: /projects/alma/arc/tw
#Disallow: /bin/getphone
Disallow: /*confidential/*
Disallow: /public/about-eso/committees/cou
Disallow: /public/about-eso/committees/cc
Disallow: /public/about-eso/committees/fc
Disallow: /public/about-eso/committees/opc
Disallow: /public/about-eso/committees/stc
Disallow: /public/about-eso/committees/uc
Disallow: /public/about-eso/committees/vc
Disallow: /projects/esocal/cs/
Disallow: /projects/esocal/esocal
#TWikis
Disallow: /*/bin/WebSearch
Disallow: /*/bin/WebChanges
Disallow: /*/bin/WebNotify
Disallow: /*/bin/login
Disallow: /*/bin/attach
Disallow: /*/bin/changes
Disallow: /*/bin/configure
Disallow: /*/bin/edit
Disallow: /*/bin/geturl
Disallow: /*/bin/installpasswd
Disallow: /*/bin/login
Disallow: /*/bin/logon
Disallow: /*/bin/logos
Disallow: /*/bin/mailnotify
Disallow: /*/bin/manage
Disallow: /*/bin/oops
Disallow: /*/bin/passwd
Disallow: /*/bin/preview
Disallow: /*/bin/rdiff
Disallow: /*/bin/rdiffauth
Disallow: /*/bin/register
Disallow: /*/bin/rename
Disallow: /*/bin/resetpasswd
Disallow: /*/bin/rest
Disallow: /*/bin/save
Disallow: /*/bin/savemulti
Disallow: /*/bin/search
Disallow: /*/bin/setlib.cfg
Disallow: /*/bin/statistics
Disallow: /*/bin/testenv
Disallow: /*/bin/twiki
Disallow: /*/bin/upload
Disallow: /*/bin/viewauth
Disallow: /*/bin/viewfile

# icons etc
# Disallow: /gif/                   
# Disallow: /icons/                 
# Disallow: /images/                

# too many files
Disallow: /it/facilities/Unixhelp 
Disallow: /it/manuals             
Disallow: /it/scisoft/star   
Disallow: /observing/dfo/status

# internal
Disallow: /projects/alma/faqs     
Disallow: /webproject/
Disallow: /sci/facilities/paranal/sciops/team_only/
Disallow: /paranal/sciops/team_only/
Disallow: /2007/intra
Disallow: /intra
Disallow: /sdd

# other
User-agent: WebCopier
Disallow: /

# Yahoo
User-agent: puf
Disallow: /

sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

B

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

REVIEW

www/non-www, trailing slash, HTTP→HTTPS

www/non-www redirect configured correctly (preferred: non-www)

HTTP version does not redirect to HTTPS

Got: HTTP 302 Expected: 301 redirect to HTTPS

www / non-www

302https://www.eso.org/

200https://eso.org/

Preferred variant: non-www

HTTP → HTTPS

302http://eso.org/ → http://eso.org/public/

HTTP version does not redirect to HTTPS

B

TLS Certificate Expiry & Recommendations

168 days until leaf cert expires — 6 issues to address

REVIEW

Certificate validity

168

days left

0d 30d 60d 90d+

Recommended actions

Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
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 Records

1 A records, 179 ms lookup

PASS

1 A records, 179 ms lookup

Resolves to 1 IPv4 address(es)

Got: 134.171.75.1

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

No IPv6 (AAAA) records

4 nameserver(s) configured

Got: dnsslave2.hq.eso.org, dnsslave1.sc.eso.org, dnsslave2.sc.eso.org, dnsslave1.hq.eso.org

1 mail exchanger(s) configured

CAA records not checked

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

SPF record present in TXT

DNS resolution time: 179 ms

Got: 179 ms

A	134.171.75.1
AAAA	—
CNAME	—
NS	dnsslave2.hq.eso.org, dnsslave1.sc.eso.org, dnsslave2.sc.eso.org, dnsslave1.hq.eso.org
MX	10 eso-org.mail.protection.outlook.com
TXT	cisco-ci-domain-verification=54ef0413fbaa4879bfce2916c97ec6bf316d462a9e9cd924139... fc0509e688cefd638caf6699d4112b50978229f808715ce2ab google-site-verification=QSkhr8v4m0uSSMqPUsZ05Pmla3_xgrBO_pMY5ZsjTIY google-site-verification=42STXdibM2OWALosfjc5uk4o9q8_ZUTYtMniIgWmBs0 MS=ms14993896 zr9W1tIwY2CIMCuH7FeI4CQqbbMUGAwWGci3CohpHbSGEv2Pa3S7Vv55j2gEMaGHxHnLXUg+WDebArMV... autodesk-domain-verification=kxQmuQwAneo4Gb9Go5Na adobe-idp-site-verification=0288fe76f2783415b251fcbd6e53c4e2cb945df670c1acb5ff48... apple-domain-verification=NqSEBIFXGUTBfcfp SPF v=spf1 a:web-app-01.inriva.com ip4:85.184.250.78 include:mail.infrastructure.ser...
CAA	Lookup not available with standard resolver

Resolved in 179 ms

Multiple A records provide failover if one server goes down.

Why this matters

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.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A+

Domain Intelligence

eso.org — via Key-Systems GmbH, 35 years, 8 months old, hosted on Garching, Germany, DE

PASS

eso.org — via Key-Systems GmbH, 35 years, 8 months old, hosted on Garching, Germany, DE

Domain registered until Feb 7, 2031 (4 years, 10 months remaining)

DNSSEC is not enabled

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Registrar: Key-Systems GmbH

Registrar lock is NOT enabled

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.

Hosting: Garching, Germany, DE

Got: AS2117

Domain expiry

1697 days

February 7, 2031

SSL certificate

168 days

Issued by Hellenic Academic and Research Institutions CA

Domain age

35 years, 8 months

Registered February 6, 1991

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Garching, Germany, DE

ASN AS2117

134.171.75.1

Registrar

Key-Systems GmbH

Unlocked 4 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Enable DNSSEC to protect visitors from DNS spoofing
Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers

Registrar Key-Systems GmbH

Created February 6, 1991 (35 years, 8 months ago)

Expires February 7, 2031 (4 years, 10 months)

Last Updated November 20, 2025

Name Servers dnsslave1.hq.eso.org, dnsslave2.hq.eso.org, dnsslave1.sc.eso.org, dnsslave2.sc.eso.org

DNSSEC Not enabled

Hosting

IP Address 134.171.75.1

ASN AS2117 (Garching, Germany, DE)

Provider Garching, Germany, DE

Data source: rdap (0.8s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.

Learn more ▾

DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.

Source: ICANN / RFC 4033

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.

Why this matters

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

A

HTTP Probe Timing

Total 713 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

PASS

DNS Lookup

2 ms

TCP Connect

173 ms

TLS Handshake

350 ms

Time to First Byte

713 ms

Total Time

713 ms

Connection waterfall

DNS Lookup 2 ms TCP Connect 173 ms TLS Handshake 350 ms Server Processing 187 ms Content Transfer 0 ms