Protocols
TLS 1.3	Yes
TLS 1.2	Yes
TLS 1.1	No
TLS 1.0	No
SSL 3	No
SSL 2	No

Cipher Suites
# TLS 1.3 (suites in server-preferred order)
TLS_AES_128_GCM_SHA256 (0x1301)   ECDH x25519 (eq. 3072 bits RSA)   FS	128
TLS_AES_256_GCM_SHA384 (0x1302)   ECDH x25519 (eq. 3072 bits RSA)   FS	256
TLS_CHACHA20_POLY1305_SHA256 (0x1303)   ECDH x25519 (eq. 3072 bits RSA)   FS	256P
# TLS 1.2 (suites in server-preferred order)
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)   ECDH x25519 (eq. 3072 bits RSA)   FS	128
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   ECDH x25519 (eq. 3072 bits RSA)   FS	256
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca8)   ECDH x25519 (eq. 3072 bits RSA)   FS	256P
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (0x9e)   DH 2048 bits   FS	128
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0x9f)   DH 2048 bits   FS	256
(P) This server prefers ChaCha20 suites with clients that don't have AES-NI (e.g., Android devices)

Handshake Simulation
Android 4.4.2	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Android 5.0.0	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Android 6.0	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Android 7.0	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Android 8.0	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Android 8.1	-	TLS 1.3	TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Android 9.0	-	TLS 1.3	TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
BingPreview Jan 2015	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Chrome 49 / XP SP3	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Chrome 69 / Win 7  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Chrome 70 / Win 10	-	TLS 1.3	TLS_AES_128_GCM_SHA256   ECDH x25519  FS
Chrome 80 / Win 10  R	-	TLS 1.3	TLS_AES_128_GCM_SHA256   ECDH x25519  FS
Firefox 31.3.0 ESR / Win 7	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Firefox 47 / Win 7  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Firefox 49 / XP SP3	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Firefox 62 / Win 7  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Firefox 73 / Win 10  R	-	TLS 1.3	TLS_AES_128_GCM_SHA256   ECDH x25519  FS
Googlebot Feb 2018	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
IE 11 / Win 7  R	RSA 4096 (SHA384)	TLS 1.2	TLS_DHE_RSA_WITH_AES_128_GCM_SHA256   DH 2048  FS
IE 11 / Win 8.1  R	RSA 4096 (SHA384)	TLS 1.2	TLS_DHE_RSA_WITH_AES_128_GCM_SHA256   DH 2048  FS
IE 11 / Win Phone 8.1  R	Server sent fatal alert: handshake_failure
IE 11 / Win Phone 8.1 Update  R	RSA 4096 (SHA384)	TLS 1.2	TLS_DHE_RSA_WITH_AES_128_GCM_SHA256   DH 2048  FS
IE 11 / Win 10  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Edge 15 / Win 10  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Edge 16 / Win 10  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Edge 18 / Win 10  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
Edge 13 / Win Phone 10  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Java 8u161	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Java 11.0.3	-	TLS 1.3	TLS_AES_128_GCM_SHA256   ECDH secp256r1  FS
Java 12.0.1	-	TLS 1.3	TLS_AES_128_GCM_SHA256   ECDH secp256r1  FS
OpenSSL 1.0.1l  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
OpenSSL 1.0.2s  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
OpenSSL 1.1.0k  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH x25519  FS
OpenSSL 1.1.1c  R	-	TLS 1.3	TLS_AES_128_GCM_SHA256   ECDH x25519  FS
Safari 6 / iOS 6.0.1	Server sent fatal alert: handshake_failure
Safari 7 / iOS 7.1  R	Server sent fatal alert: handshake_failure
Safari 7 / OS X 10.9  R	Server sent fatal alert: handshake_failure
Safari 8 / iOS 8.4  R	Server sent fatal alert: handshake_failure
Safari 8 / OS X 10.10  R	Server sent fatal alert: handshake_failure
Safari 9 / iOS 9  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 9 / OS X 10.11  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 10 / iOS 10  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 10 / OS X 10.12  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Safari 12.1.2 / MacOS 10.14.6 Beta  R	-	TLS 1.3	TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Safari 12.1.1 / iOS 12.3.1  R	-	TLS 1.3	TLS_CHACHA20_POLY1305_SHA256   ECDH x25519  FS
Apple ATS 9 / iOS 9  R	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
Yahoo Slurp Jan 2015	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
YandexBot Jan 2015	RSA 4096 (SHA384)	TLS 1.2	TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256   ECDH secp256r1  FS
# Not simulated clients (Protocol mismatch)
Android 2.3.7   No SNI 2	Protocol mismatch (not simulated)
Android 4.0.4	Protocol mismatch (not simulated)
Android 4.1.1	Protocol mismatch (not simulated)
Android 4.2.2	Protocol mismatch (not simulated)
Android 4.3	Protocol mismatch (not simulated)
Baidu Jan 2015	Protocol mismatch (not simulated)
IE 6 / XP   No FS 1   No SNI 2	Protocol mismatch (not simulated)
IE 7 / Vista	Protocol mismatch (not simulated)
IE 8 / XP   No FS 1   No SNI 2	Protocol mismatch (not simulated)
IE 8-10 / Win 7  R	Protocol mismatch (not simulated)
IE 10 / Win Phone 8.0	Protocol mismatch (not simulated)
Java 6u45   No SNI 2	Protocol mismatch (not simulated)
Java 7u25	Protocol mismatch (not simulated)
OpenSSL 0.9.8y	Protocol mismatch (not simulated)
Safari 5.1.9 / OS X 10.6.8	Protocol mismatch (not simulated)
Safari 6.0.4 / OS X 10.8.4  R	Protocol mismatch (not simulated)
Click here to expand
(1) Clients that do not support Forward Secrecy (FS) are excluded when determining support for it.
(2) No support for virtual SSL hosting (SNI). Connects to the default site if the server uses SNI.
(3) Only first connection attempt simulated. Browsers sometimes retry with a lower protocol version.
(R) Denotes a reference browser or client, with which we expect better effective security.
(All) We use defaults, but some platforms do not use their best protocols and features (e.g., Java 6 & 7, older IE).
(All) Certificate trust is not checked in handshake simulation, we only perform TLS handshake.

Protocol Details
Secure Renegotiation	Supported
Secure Client-Initiated Renegotiation	No
Insecure Client-Initiated Renegotiation	No
BEAST attack	Mitigated server-side (more info)
POODLE (SSLv3)	No, SSL 3 not supported (more info)
POODLE (TLS)	No (more info)
Zombie POODLE	No (more info)
GOLDENDOODLE	No (more info)
OpenSSL 0-Length	No (more info)
Sleeping POODLE	No (more info)
Downgrade attack prevention	Yes, TLS_FALLBACK_SCSV supported (more info)
SSL/TLS compression	No
RC4	No
Heartbeat (extension)	No
Heartbleed (vulnerability)	No (more info)
Ticketbleed (vulnerability)	No (more info)
OpenSSL CCS vuln. (CVE-2014-0224)	No (more info)
OpenSSL Padding Oracle vuln. (CVE-2016-2107)	No (more info)
ROBOT (vulnerability)	No (more info)
Forward Secrecy	Yes (with most browsers)   ROBUST (more info)
ALPN	No
NPN	No
Session resumption (caching)	Yes
Session resumption (tickets)	Yes
OCSP stapling	No
Strict Transport Security (HSTS)	Yes max-age=63072000
HSTS Preloading	Not in: Chrome  Edge  Firefox  IE
Public Key Pinning (HPKP)	No (more info)
Public Key Pinning Report-Only	No
Public Key Pinning (Static)	No (more info)
Long handshake intolerance	No
TLS extension intolerance	No
TLS version intolerance	No
Incorrect SNI alerts	No
Uses common DH primes	No
DH public server param (Ys) reuse	No
ECDH public server param reuse	No
Supported Named Groups	x25519, secp256r1, x448, secp521r1, secp384r1 (server preferred order)
SSL 2 handshake compatibility	Yes
0-RTT enabled	No

HTTP Requests

1 https://www.uni-heidelberg.de/  (HTTP/1.1 301 Moved Permanently)
1
	server	nginx
	date	Fri, 13 Jun 2025 11:25:45 GMT
	content-type	text/plain; charset=utf-8
	content-length	37
	x-powered-by	Express
	vary	Accept-Language, Accept
	location	/en
	x-varnish	108595845 106954841
	age	67
	via	1.1 varnish (Varnish/6.0)
	x-varnish-cache	HIT
	strict-transport-security	max-age=63072000
	set-cookie	d60c1da73e120cb71d18e08fbc35afe3=4b24bc715d703bb37c9939cc038ca63b; path=/; HttpOnly; Secure; SameSite=None
	connection	close

2 https://www.uni-heidelberg.de/en  (HTTP/1.1 200 OK)
2
	server	nginx
	date	Fri, 13 Jun 2025 11:25:46 GMT
	content-type	text/html; charset=utf-8
	content-length	286929
	x-powered-by	Express
	cache-tags	2TVk qBJu wR-K DLCQ CpOm yJuF aqAq 2Ewv dVXg 5Xz6 NGjB QBaD 9wv5 lB-I RJMM R208 JKpK i370 hu54 9Bja QtQd aXky Uuy- tLSa PeFW WbBj PW6Y zGCx RVNQ hMH3 wVyt gq0k jt6M KlN4 z0ry eixT p_ev b5aH wBpp mheQ -_X2 KCbU 73TU 4plL FEUR XFud t7s0 Z7rH quZQ 0DHU tzoh mHGD ZZTp fdnr NIaT nvtY zDJ3 tXK6 oeQ8 BWQH VZN1 sLSD k44e nFge pHvM at9A cahf z035 GTe7 ttI7 JOT4 fN_c 4b_E Gqaa KWQU bPRm lE_1 Hwe9 jkPq sqaj kmr9 9peH ukjW RC0e uSld CSWl kDui yM-9 tSGm IrOp D1Qu tk2K ejrb 3rbn ZUg0 -r6x _APu OF0l oxET QFCy Niev C6-z DQs6 cWjO SqsR nzL5 uEGg ynIs GknN 92e7 Kyr1 689P B1IU V1XM AAFp NfNZ CaK4 DB3L zCJn 2ZXW elbl
	cache-control	public, max-age=0, s-maxage=2628000
	x-varnish	106168692 108789916
	age	68
	via	1.1 varnish (Varnish/6.0)
	x-varnish-cache	HIT
	accept-ranges	bytes
	strict-transport-security	max-age=63072000
	connection	close

Miscellaneous
Test date	Fri, 13 Jun 2025 11:25:19 UTC
Test duration	89.765 seconds
HTTP status code	200
HTTP server signature	nginx
Server hostname	lb1-ocp-west.urz.uni-heidelberg.de