Lovlace not accessable, server running,, rebooted, console OK, Unable to connect to Home Assistant

Installation
1

Running homeassistant since about 8 years, latest update in february, never had a problem. Yesterday access ok. Today the screen with the symbol cames up and "Unable to connect to Home Assistant, will retry in x seconds. Restartet the server running as VM on Proxmox since more than than a year without problems, can ping the server, console looks fine. Did no change since yesterday. out of any Ideas

Thanks for any help

2

SOLVED tried another browser Firefox normaly not used) and it works. So I did reset Cookies in Chrome and it works. Do not know whats change between yesterday and today. Same client. But even other clients had the same problem, they never had before, but worked after resetting cookies

Rainer