Review vRealize Automation appliance vCO Service ciphers against the list of acceptable ciphers and disable all of those considered weak.

Disable cipher suites that do not offer authentication such as NULL cipher suites, aNULL, or eNULL. Also disable anonymous Diffie-Hellman key exchange (ADH), export level ciphers (EXP, ciphers containing DES), key sizes smaller than 128 bits for encrypting payload traffic, the use of MD5 as a hashing mechanism for payload traffic, IDEA Cipher Suites, and RC4 cipher suites.


  1. Locate the <Connector> tag in /etc/vco/app/server/server.xml file.
  2. Edit or add the cipher attribute to use the desired cipher suites.

    Refer to the following example: