Virtual Printer keeps dropping connection to the printers, and then reconnecting. Help or advice please!

Hello, 


We have an issue with the virtual printer app on all our packing stations -the printers keep connecting and disconnecting, (or not connecting at all!), even though they show as being online. Both printers will be knocked out at the same time, so I'm assuming this is a network communication issue.


Was wondering if anyone here had the same experience, and what was done to remedy it? (We're not getting far with support..)


We have allowed app access to port 80, TCP 1433 and 5079 from windows defender, and also whitelist linnworks.net from our router firewall. We do not use Adblock or other browser extensions.


Our printers are Zebra ZM600's with each once connected to it's own packing desk PC via USB. (should the printers be connected directly via ethernet, for the virtual printer app to run properly? - this is the only avenue we have not explored...)


Any help or advice would be greatly appreciated!



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