OFFLINE POS not Syncing

Good Afternoon,

I am having a slight issue here where I have 3 Offline POS systems connected to the same site and on the same network making transactions. 2 of the systems currently have their invoice syncing with no issues. however, one of the systems keeps throwing a request timed out. I thought it was a network issue but after restarting, I can log into frappe/erpnext but whenever i try to sync offline invoices…the same issue still pops up.
Can anyone please assist on this issue?

Console in the error message? If it’s working fine for all, but for this, issue could be something local only. console traceback should help.

Please find the console log below

desk.min.js?ver=1521609136.0:1548 POST 504 (Gateway Time-out)

send @ jquery.min.js:4

ajax @ jquery.min.js:4

frappe.request.call @ desk.min.js?ver=1521609136.0:1548

frappe.call @ desk.min.js?ver=1521609136.0:1441

sync_sales_invoice @ VM44:2464

(anonymous) @ VM44:806

dispatch @ jquery.min.js:3

$event.dispatch @ report.min.js?ver=1521609136.0:3020

r.handle @ jquery.min.js:3

desk.min.js?ver=1521609136.0:1548 POST 504 (Gateway Time-out)

send @ jquery.min.js:4

ajax @ jquery.min.js:4

frappe.request.call @ desk.min.js?ver=1521609136.0:1548

frappe.call @ desk.min.js?ver=1521609136.0:1441

set_indicator @ VM44:759

(anonymous) @ VM44:750
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Hello @olamide_shodunke, @kolotayo

Did you resolve this issue? I keep having this problem popping up, it’s like whack-a-mole.