Checked and tested the error encountered by PASI from testing the POS2NAV which is from the Web Service Address. Checked if domain account of user is added to cfg file inside the server. Add user account on FSRI folder under properties> security> add user. Did the same on the SP folder of end user then checked if server is mapped in network of end user. Asked the user to parse and upload to POS2NAV, the same error appeared "The underlying connection was closed: An unexpected error occurred on a receive". Seek advice from Elbert and he tried to remote the user to check the issue. This will be continued on Tuesday.