Proxy server stops responding?

he
1

I have to take on online training courses tomorrow with the company's laptop, I was able to connect to the internet without any problems, but can't access the internet.

Could someone help me what I can do there.

al

The error message you get already gives you solutions.

Check the proxy settings
Make sure you aren't being blocked by the firewall
Contact the system administrator

We can't help you much here because we don't work in your company and don't know the relevant infrastructure.
Please write an e-mail to the responsible admins and provide as much information as possible so that your problem can be resolved quickly.