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https://uoa.gr

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
74
GRADE
C
FIX
1
REVIEW
5
PASS
2
INFO
1
Probed from Singapore, Singapore
301 Moved Permanently
Checks
9
2 PASS 5 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
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), 2207 ms total
REVIEW
1 redirect(s), 2207 ms total
Info::
Single redirect
Got: https://uoa.gr → https://www.uoa.gr/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 2207 ms total
Got: 2207 ms

https://uoa.gr

698 ms · HTTP/1.1

301

https://www.uoa.gr/

1509 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://uoa.gr301698 msHTTP/1.1nginx
2https://www.uoa.gr/2001509 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
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
Info::
robots.txt is present
Got: 465 bytes
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.
Info::
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 465 B Sitemaps referenced 0 User-agents * Blocking No — crawling allowed
User-agent: *

# Only allow URLs generated with RealURL
Disallow: /*?id=*
Disallow: /*&id=*

# Should always be protected (.htaccess)
Disallow: /*/Private/*
Disallow: /fileadmin/templates/html/*
Disallow: /*/Configuration/*

Disallow: /typo3temp/*
Allow: /typo3temp/*.css
Allow: /typo3temp/*.css.*.gzip
Allow: /typo3temp/*.js
Allow: /typo3temp/*.js.*.gzip
Allow: /typo3temp/*.jpg
Allow: /typo3temp/*.gif
Allow: /typo3temp/*.png

Disallow: *.sql
Disallow: *.sql.gz
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
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.uoa.gr/
200https://uoa.gr/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://uoa.gr/ → https://www.uoa.gr/

Consistent

B
TLS Certificate Expiry & Recommendations
74 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

74
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • 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, 917 ms lookup
PASS
1 A records, 917 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 51.145.182.78
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns2.uoa.gr, sns0.grnet.gr, sns1.grnet.gr, ns1.uoa.gr
Info::
2 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Warning::
DNS resolution is slow (917 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 917 ms
A51.145.182.78
AAAA—
CNAME—
NSns2.uoa.gr, sns0.grnet.gr, sns1.grnet.gr, ns1.uoa.gr
MX
5 mta02.uoa.gr
5 mta01.uoa.gr
TXT
SPF v=spf1 include:spfpolicy.uoa.gr ?all
adobe-idp-site-verification=2ea5ab17fb900cbf8e49828102579697ac5cb3a4ebfeb6dadf3d...
google-site-verification=NWYUxKr5nPkksg6OsOpg1-0bYLt7Ov-0qWsVrCd7bRE
ras gk.uoa.gr:1719
google-site-verification=eRZKGDlk5hzNfD9hR1_vxkRbVdMNrkm0GxQfv9-YCyU
HARICA-lQCHj3oFvMD1L0TFVg3
MS=ms60970856
google-site-verification=VxyZIcwZ9dG-B0CFG9oAEL9FjEZkyqfhVLmPrFP7y6Q
google-site-verification=zD5Sp-DPrTtuiG8tdvGaLUJ3OUgGIV1N_97XxEUq99E
webexdomainverification.83HN6=4e31fe87-410c-4649-a013-6d78f78a3db0
cisco-ci-domain-verification=1293fe87450cda58f4dd189c3fe7d7580f92007bea7bae1832b...
CAALookup not available with standard resolver
Resolved in 917 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.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A
HTTP Probe Timing
Total 708 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
208 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
166 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
168 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
708 ms
Total Time Total request time from DNS lookup through full response.
708 ms

Connection waterfall

DNS Lookup 208 ms TCP Connect 166 ms TLS Handshake 168 ms Server Processing 166 ms Content Transfer 0 ms
Domain Intelligence
Domain intelligence data not available
INFO
Domain intelligence data not available

RDAP and WHOIS lookup both failed

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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