Edit the /etc/neutron/plugins/ml2/ml2_conf_oracle_es2.ini file to set the ofm_verify_certificate environment variable to True, as shown:
ofm_verify_certificate=True
The variable might be set to True by default, but verify that it is enabled.
Install a properly signed SSL Certificate for Oracle Fabric Manager. For further details, refer to the topic about configuring a certificate for Oracle Fabric Manager in the Oracle Fabric Manager User's Guide.