Who is responsible for updating network firewalls?

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It all depends on the roles and responsibility as defined by your organization in their IS/IT policies. Generally, the Information Security Group is responsible for defining the security rules and policies; implanting and enforcing the same through security architecture around the network infrastructure, and auditing the IS policy compliance within the organization.

The network guys do the installation and management of the network devices. The configuration should be done based on the security policies throughout the network infrastructure.

The important thing to consider is that in order to provide a stable and secure environment, these two groups must work together as a team or else things might fail.