Issues with windows Update

I have a proxy internet in my university. I have used the proxy in my proxy settings as 172.30.10.10 and port 3128. Now, Windows Update is not working, showing error 0x8024401c. I have searched and tried many solutions, including importing the proxy using winhttp in cmd and putting proxy in network isolation in gpedit. Every time, I made change, I restarted my laptop but still it comes with the same error. I have installed Windows 10 1709. Note: I updated all the updates using my home internet which is free proxy net. There everything was fine. But here, showing problem. Help me with that. Thanks.