Recently ran into Connection Error 2603 on Microsoft Teams and it turned out to be a Network issue.
Steps to fix Teams 2603 Connection Error:
- Make sure that you have an active internet connection (check your WiFi, Ethernet connection)
- It may be that you are on wifi and you see the full signal, but there is no internet connectivity, try accessing the web or any other application to see if they are working.
- If you have internet, check the firewall setting.
- If on Windows, make sure you have the latest version of Windows OS installed (check for updates if on Windows 7, also make sure your Edge browser is up to date)
A note from : https://docs.microsoft.com/en-us/microsoftteams/hardware-requirements-for-the-teams-app,
.NET version: Requires .NET 4.5 CLR or later
Operating system: Windows 11, Windows 10 (excluding Windows 10 LTSC), Windows 10 on ARM, Windows 8.1, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2. Note: We recommend using the latest Windows version and security patches available.
- How to track and download Microsoft Teams meeting attendance report of participants/students
- How to Install Microsoft Teams App on M1 or M2 Mac
- How to uninstall/remove or disable Microsoft Teams
- How to enable, create and use Virtual Breakout Rooms in Microsoft Teams
- Cannot open or preview pdf with view only and restricted download access in Microsoft Teams
- How to enable Do Not Disturb (DND) mode in Microsoft Teams
- Microsoft Teams - Where would you like to start - Business or Personal
- [fix] White Screen when open Teams on Windows
- How to turn on channel notifications for Microsoft Teams
- Fix: Teams is in preview in Safari on Mac
- Microsoft Teams Error code - 6 issue
- Microsoft Teams Zoom In and Zoom Out Keyboard Shortcut
- [Microsoft Teams] You're not on Teams yet, but you can set it up for your organization.
- Microsoft Teams meeting Full Screen mode option missing - bring it back
- Fix Something went wrong 0xCAA20004 [Microsoft Teams]
- Cannot access files within Microsoft Teams - We are setting up your file directory
- How to Enable Dark Mode Theme in Microsoft Teams
- [Fix] Modern authentication failed here, but youll still be able to sign in. Your status code is 4c7 - Microsoft Teams
- Microsoft Teams enable or disable Spell check
- Fix Microsoft Teams Admin Center error - The Security zone setting isn't configured correctly
- Microsoft Teams adds New Conversation Button
- Microsoft Teams Error - You cannot add another work account to Teams at the moment
- How to Update Microsoft Teams to the latest Version
- Cannot create new Microsoft Team using PowerShell, even as Admin
- Java: Create Temporary Directory and File and Delete when application terminates - Java
- XmlRpcException ConnectException connection refused error - Java
- Create an S3 bucket in a specific AWS region using CLI Command - AWS
- Turn off Auto-Capitalization on macOS Ventura 13 - MacOS
- Multiple ways to Convert tabs with spaces in Notepad++ - NotepadPlusPlus
- [Solution] IntelliJ: Cannot find declaration to go to, Nothing here, Java file outside of source root Errors - Java
- Setting up Zsh Syntax Highlighting - zsh
- Open file using CMD in Notepad++ - NotepadPlusPlus