Test for SSL version

Published on October 01, 2008

Most web servers that run SSL (https) run on SSL version 3 or TLS version 1. There are still some outdated servers running SSL version 2.

To check if your web server is running SSL v2.0, run this on your Unix/Linux console:

openssl s_client -connect localhost:443 -ssl2

If it shows an error like SSL2_WRITE:ssl handshake failure:s2_pkt.c, it means SSL v2.0 has been disabled.

EXAMPLE: Lets test if slashdot.org is running SSL v2.0 or v3.0.

Check for SSL version 2

$ openssl s_client -connect slashdot.org:443 -ssl2
11358:error:1407F0E5:SSL routines:SSL2_WRITE:ssl handshake failure:s2_pkt.c:428:

Check for SSL version 3

$ openssl s_client -connect slashdot.org:443 -ssl2
depth=0 /C=US/O=slashdot.org/OU=3246035501/OU=See www.geotrust.com/resources/cps (c)08/OU= 
   Domain Control Validated - QuickSSL(R)/CN=slashdot.org
verify error:num=20:unable to get local issuer certificate
verify return:1
New, TLSv1/SSLv3, Cipher is RC4-MD5
Server public key is 1024 bit
Compression: NONE
Expansion: NONE
    Protocol  : SSLv3
    Cipher    : RC4-MD5

Enable version SSLv3 and disable SSLv2

Edit Apache's ssl.conf and include these lines at minimum:

SSLProtocol -all +SSLv3

Restart Apache and you're good to go.

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Published on October 01, 2008