An encryption error might occur if the cipher suite is not specified correctly in the CICS Transaction Gateway configuration file.
CICS Transaction Gateway starts with the following Java exception:
CTG6525E Unable to start handler for the ssl: protocol because: java.lang.IllegalArgumentException:CTG6495E No cipher suites available for use by SSL connection
If more than one cipher suite is used but only one is valid, the following message is displayed for the valid cipher suite (the other is ignored):
CTG8401I The following ciphers are enabled: SSL_RSA_WITH_NULL_SHA >
The cipher suite is not specified correctly in the ciphersuites parameter in the CICS Transaction Gateway configuration file.
Edit the CICS Transaction Gateway configuration file to specify the cipher suite correctly.