Why is this an issue?
Protecting the security and privacy of our customers is among our top priorities, so ServiceNow utilizes SSL/TLS to encrypt communications for all customer instances.
Use the glide.outbound.sslv3.disabled property to force the MID Server to use TLS when making outbound connections, such as REST and SOAP requests. TLS give to instance more security, so it's more recommended.
Best practices
Set this glide.outbound.sslv3.disabled property value to TRUE and then your institution will only use TLS as a form of security.