I been getting this error, when playing with the pos. I have it on 2 of my dev instances. One which is a fresh install and I modified the pos.js and pos.py files. Any clues to what this could be?
libs.min.js:3865 GET http://http:6787/socket.io/?EIO=3&transport=polling&t=1493632205377-0 net::ERR_NAME_NOT_RESOLVEDRequest.create @ libs.min.js:3865Request @ libs.min.js:3788XHR.request @ libs.min.js:3719XHR.doPoll @ libs.min.js:3749Polling.poll @ libs.min.js:4138Polling.doOpen @ libs.min.js:4082Transport.open @ libs.min.js:3259Socket.open @ libs.min.js:2689Socket @ libs.min.js:2571Socket @ libs.min.js:2506Manager.open.Manager.connect @ libs.min.js:1245Manager @ libs.min.js:1103Manager @ libs.min.js:1073lookup @ libs.min.js:1006setup_file_watchers @ desk.min.js:168init @ desk.min.js:153startup @ desk.min.js:1169load_startup @ desk.min.js:1169init @ desk.min.js:1169Class @ desk.min.js:3frappe.start_app @ desk.min.js:1167(anonymous function) @ desk.min.js:1169i @ jquery.min.js:2fireWith @ jquery.min.js:2ready @ jquery.min.js:2J @ jquery.min.js:2
libs.min.js:3865 GET http://http:6787/socket.io/?EIO=3&transport=polling&t=1493632206037-4 net::ERR_NAME_NOT_RESOLVEDRequest.create @ libs.min.js:3865Request @ libs.min.js:3788XHR.request @ libs.min.js:3719XHR.doPoll @ libs.min.js:3749Polling.poll @ libs.min.js:4138Polling.doOpen @ libs.min.js:4082Transport.open @ libs.min.js:3259Socket.open @ libs.min.js:2689Socket @ libs.min.js:2571Socket @ libs.min.js:2506Manager.open.Manager.connect @ libs.min.js:1245(anonymous function) @ libs.min.js:1510