Hello everyone: I am facing thie error 2603 while login to Microsoft Office:

Hi, Tayyab Shahzad

Welcome to the Microsoft Community.

For error 2603, there may be issues such as "TLS, proxy, or firewall security protocol configuration that may cause Office to not correctly establish a connection to the Microsoft server." It is recommended that you follow the following steps to check one by one:

1. Check TLS settings:

Press the Win + R keys, type "inetcpl.cpl" to open the Internet Properties window, switch to the "Advanced" tab, scroll down to the "Security" module, and make surethat "Use SSL 3.0", "Use TLS 1.0", and "Use TLS 1.1" and "Use TLS 1.2" (checked together if TLS 1.3) are enabledand click OK. This step ensures that Office uses the latest encryption protocol when turned on or connected, thus avoiding connection issues caused by protocol mismatch. 2. Check the network environment and firewall settings:

- Make sure you're in a proxy server or VPN environment, and if so, disable or temporarily adjust the settings to ensure that Office has direct access to the Microsoft activation server.
- Check your Windows firewall or other security software settings and, if necessary, try temporarily disabling the firewall to test if activation fails due to blocking specific URLs. Go to the **connections**tab and **uncheck**the proxy option.

At the same time, perform the following steps to reset your network, run the command prompt as administrator ("Win*" + "Q" logo key, type "cmd", select "Run as administrator")* and type the following commands one by one.

netsh int ip reset

netsh winsock reset

ipconfig /release

ipconfig /renew

ipconfig /flushdns

netsh winhttp reset proxy

Regarding your question, if you are on campus network or company network, please switch to mobile hotspot or another personal network. If you have VPN proxy software, internet banking software, encryption software running in the background, please quit it.

Then open the control panel on your computer -- Network and Internet -- Network and Sharing Center -- Change adapter settings. --Select your network, right-click Properties - double-click Internet Protocol version 4 - in the interface, click “Use the following Click “Use the following DNS server address” - change the preferred DNS address to 4.2.2.1 and the alternate DNS address to 4.2.2.2. Then click Apply to confirm and try to log in again to check the result.

Open the Control Panel on your computer - Network and Internet - Internet Options - Advanced - and click Restore Advanced Settings. -First click Restore Advanced Settings, then check SSL 3.0, TLS1.0, TLS1.1, TLS1.2.

Then go back to Internet Options - Connections - LAN Settings and make sure the Auto Detect setting is checked, if not please check it.

After completion, restart your PC and notice if the error message 2603 appears. Feel free to share the results so we can help you further.

Best regards

Cherry.Z | Microsoft Community Support Specialist

Hi ，Joe Kohlhepp

Thank you for your feedback and I'm glad the information provided previously helped you.

If you encounter any problems with Microsoft products afterward, you are welcome to post at any time.

Thank you again for your understanding and support, and I wish you a happy life! 😊

Best regards

Cherry.Z | Microsoft Community Support Specialist

Hi, Tayyab Shahzad

How has it been lately? 🙂

Have you tried the steps given before? How is the problem progressing? Please feel free to let us know if you need further help or have any other questions.

It is my duty to do everything I can to get back to you as soon as possible, and I am very happy if the reply I provide above can help you to know more about the problem you are experiencing. Please feel free to mark Yes above that contained the solution to make it easier for other customers with the same problem as you to find the direction to let them know more about the latest developments on this issue.  Thank you a lot.🙂

Best regards

Cherry.Z | Microsoft Community Support Specialist

Cherry:

THANK YOU! THANK YOU! THANK YOU!

I have been fighting this problem for a week.

THANK YOU!