Please follow the steps:
1. Open IIS Manager
2. Click on the Prolaborate site under Sites
3. Under Actions on the right-hand side panel, click on Bindings
4. Edit the Port. If some other site is using this port, stop that site.
5. Open Prolaborate Service Management (Sample location – C:\Program Files (x86)\Prolaborate\ProlaborateServiceManagement)
6. Click on Manage Configuration. Alter BaseURL if you have used a port other than 80 and there is no DNS.