After upgrading to Messaging Gateway (SMG) to version 10.6.3 you get an SSL error when trying to release messages from the SMG quarantine from the DLP console.
This is due to a change in ciphers that are accepted by SMG 10.6.3. SMG 10.6.3 requires TLS 1.2 ciphers and does not allow failover to TLS 1.0
Change the configuration files for flex response to use TLS version 1.2 in the following three files:
(NOTE: These files are located in <drive>:\SymantecDLP\Protect\plugins)
The setting "ssl-protocol-version = TLSv1" should be changed to "ssl-protocol-version = TLSv1.2"
Save the files and restart the Vontu Manager service.