The "SSL=1" flag in the ssa.ini file is obsolete due to implementation of TLS1.2. Previously, setting SSL=1 in the [SERVER] section of ssa.ini encrypted the Data Vault data. In version 6.4.3 HotFix 1 and later, this setting has no impact on encryption. Data will not be encrypted if SSL=1 remains in the ssa.ini file.
The SSL flag in the [COMMON] section of the ssa.ini file, which was previously required for the Data Vault Data Archive plugin, is also obsolete.