Calc external link to website not working

I want to read data from an external webpage.
I select a cell go to Menu
Sheet ▸ Link to external data.
a new window appears:
I enter URL
I hit Enter
A list of HTML_all and HTM_tables appears
I click on HTML-all
press ok
Requestor windows closes and NOTHING happens, NO data is imported
It does not matter which of the HTM_* entries I select
Always NO data is imported.
I’ve tested with several websites (urls) always the same - NO data imported at all
Many thanks for support

solved, seems external links were disabled