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"There was a connection issue" message when running or activating DeviceHub in PitneyShip or PitneyShip Pro

Learn how to resolve the error "There was a connection issue. Contact PitneyBowes. Error-Port 8091 is in use by another application." in PitneyShip or PitneyShip Pro.
Products affected: PitneyShip™, PitneyShip™ Pro

Issue

When trying to run or activate DeviceHub, the message "There was a connection issue. Contact Pitney Bowes. Error-Port 8091 is in use by another application." appears.

Cause

Port 8091 is being used by another device other than DeviceHub.

Resolution

Port 8091 needs to be isolated for DeviceHub. If another application is using port 8091, DeviceHub will not be usable. Have a technical expert review DeviceHub Networking Requirements and Technical Specifications for PitneyShip and PitneyShip Pro.

UPDATED: August 18, 2023