Windows 10: Suddenly getting this error on my web server , users are not able to access the site

HTTP Error 500.19 - Internal Server ErrorThe requested page cannot be accessed because the related configuration data for the page is invalid.Most likely causes:The worker process is unable to read the applicationhost.config or web.config file.There is malformed XML in the applicationhost.config or web.config file.The server cannot access the applicationhost.config or web.config file because of incorrect NTFS permissions.Things you can try:Look in the event logs for information about why the configuration files are not readable.Make sure the user identity specified for the application pool, or

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computer is not able to access the Server

Communication over LAN: scenario: Computer A and Server B at same data network.

a. Suddenly the computer is not able to access the Server B.
What can be the root cause? and steps to solve it?

[moved from de-de]

 

computer is not able to access the Server

What did your System Admin say when you asked them about this?

 

W10 can connect to wider internet but cannot access web pages

I have an odd issue with my W10 laptop linked to Sky broadband in the UK via wifi using a Sky router. The effect is that while I can actually access the internet (I can send and receive emails using Outlook and can connect to other machines using TeamViewer) I cannot access any web site (Google, BBC etc). There is no specific error message, merely that the access request timed out and a suggestion that it may be to do with proxy. I have tried the following:

1. Other systems (W10 and ios) can access web sites using the same Sky router (therefore probably not a router problem)
2. I have sent and received emails using Outlook, so the broadband connection is working (probably not a Sky problem)
3. I have tried two different browsers (Firefox and Edge), no connection (not a browser problem)
4. I am using Windows Defender and have:
   1. Made sure that Firefox is in the list of allowed systems in its Firewall, no connection after a reboot
   2. Turned off the Firewall and tried again - no connection

My next step will be to re-install Windows, but has anyone got any other suggestions? Could it be some sort of virus (I have carried out a complete virus check using Defender) So - any suggestions?