Continue Checking and troubleshoot the issue of FSRI regarding POS2NAV. All the users trying to upload encountered an error "The underlying connection was closed: An unexpected error occurred on a receive". Checked the connectivity if the client pc can ping the servers. Then tried if they can access the NAV, also tried reconfiguring the POS2NAV. Everything is working. We will replicate this on our PC in Accelerando to see if this is a network issue or Application issue since the POS2NAV of SSI is working fine.