The error codes means that the near side (ProScan) can't communicate with the far side (Broadcastify) for some reason. The TCP protocol doesn't specify where the problem is.
Per the FAQ page: Q: I'm using the Source Client feature to stream audio to Broadcastify. I'm experiencing intermittent dropped connections.
A: Intermittent connections could be caused by your computer, NIC card, cables, router, ISP, far end, etc. It has been suggested by a few users to use a tool called PingPlotter to isolate where the problem is.
Ensure you're not using AVG Anti-Virus software as that will interrupt TCP traffic.
If using the BCD536HP Wi-Fi, click the URL Audio Setup button and see if excessive Packet Loss shows in the dialog. Wi-Fi interference or a flaky Dongle could cause excessive packet loss. Move the dongle and scanner to another location to see if the packet loss decreases.
I would suggest you download and install Pingplotter Troubleshoot Home Network Problems | PingPlotter Standard
This program has been invaluable to me in pinpointing my error code 10 issues. In my case, there was an issue reaching hop#1, which was my PC to router connection. I realized that the driver for the wifi port was incorrect, providing only a weak and intermittent 2.4 GHz connection. I downloaded the latest and correct driver and immediately my connection to the Broadcastify server was stabilized and at the 5 GHz speed.
I keep the Pingplotter window open at all times to diagnose any latency/disconnect issues. On the rare occasion I do suffer disconnects to the Bcast server, I can see which hop in the path it occurs, which is usually in the last 3 hops. BTW, I am using Spectrum as my provider.
Basically, Pingplotter will help you determine whether the disconnect/error code is occurring on your end or farther down the hop toward the Bcast target.