No migration file present, remote export started

I would like some help with analysis why Shipper doesn’t want to move any of my 3 trial-to-move websites its stuck at 1% or [Task 1 of 14]: Export remote system

WPMUDEV Hosting < Self hosting on VestaCP (Ubuntu 18.04 LTS)

March 5, 2019 4:21 pm - No migration file present, remote export started
March 5, 2019 4:21 pm - [Task 1 of 14]: Export remote system
March 5, 2019 4:20 pm - No migration file present, remote export started
March 5, 2019 4:20 pm - [Task 1 of 14]: Export remote system
March 5, 2019 4:20 pm - No migration file present, remote export started
March 5, 2019 4:20 pm - [Task 1 of 14]: Export remote system
March 5, 2019 4:19 pm - No migration file present, remote export started
March 5, 2019 4:19 pm - [Task 1 of 14]: Export remote system
March 5, 2019 4:18 pm - No migration file present, remote export started
March 5, 2019 4:18 pm - [Task 1 of 14]: Export remote system

WPMUDEV Hosting < Self hosting on IIS 8.0 (Windows Server 2012 R2)

March 5, 2019 4:22 pm - Remote domain reachable, attempting export
March 5, 2019 4:22 pm - Pinging remote domain
March 5, 2019 4:22 pm - Attempting remote export auto-start
March 5, 2019 4:22 pm - No migration file present
March 5, 2019 4:22 pm - [Task 1 of 14]: Export remote system
March 5, 2019 4:21 pm - No migration file present, remote export started
March 5, 2019 4:21 pm - [Task 1 of 14]: Export remote system
March 5, 2019 4:21 pm - No migration file present, remote export started