What a MID Server Does
A MID server is a lightweight on-prem agent that lets the instance reach behind-firewall resources for Discovery, Orchestration, and IntegrationHub. It polls the instance for work — no inbound firewall holes needed.
Sizing Isn’t Guesswork
MID server sizing depends on workload: number of probes per hour, script execution load, integration volume. Use the MID server capacity calculator. Most orgs under-provision.
Load Balance via Clusters
Don’t run a single MID server for production. Put 2+ in a cluster so probes distribute and failure is survivable. Dedicated clusters per use case (Discovery, Integration) keep noisy neighbors out.
Credentials and the Credential Vault
Credentials live on the MID server or in credential store. Never put production credentials in scripts. The discovery credential store handles rotation when you invest the setup time.
Upgrade Cadence
MID servers auto-upgrade with the instance by default. In regulated environments, pin the version and test. MID server incompatibility breaks Discovery; test in sub-prod first.