When overseas users connect using central Windows Virtual Desktop there is no problem. All users belongs to the same domain, are governed by the central IT and have the same system configuration, but only overseas users can't connect. Server is on-premise and is local to my business unit. I am working in a corporate environment and this error is specific to only a certain users of my application. I am an app developer, not a system nor network expert so please bear with me if description of my issue is vague or simplistic. 0 (X64) 17:36:31 Copyright (c) Microsoft Corporation Standard Edition (64-bit) on Windows NT 6.3 (Build 9600: ) (Hypervisor) (provider: TCP Provider, error: 0 - The semaphore timeout period has expired. When I try to connect to the SQL Server I get the following error:Ī connection was successfully established with the server, but then an error occurred during the pre-login handshake.