serial port unavailable

Hi Can some one help

New to this
I am on Arduino web browser interface
keep getting message "serial port unavailable"
Tried it across two standard sketches
Using windows system
Can someone help
Thanks

What does device manager say when you connect the board? Any (new) yellow exclamation marks for unknown device?

Not familiar with the web interface so no idea further.

@HAM_BRO

Moved your topic to it's current location / section as it is more suitable.

There are sticky posts at the top of this section that should help to either get you up and running or help you give some more information to help us to help you.

Could you take a few moments to Learn How To Use The Forum.
Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.

Bob.