The following actions failed and should be performed manually to complete your marketing cloud configuration. Please refer to help.salesforce.com for instructions.
Email Send Scheduled Send Workflow : IO Exception: Read timed out
Mobile Send Backup Workflow : IO Exception: Read timed out
Mobile Send Scheduled Send Workflow : IO Exception: Read timed out
Triggered Send Backup Workflow : IO Exception: Read timed out
What are the potential problems causing this?