Thanks menotu, but that does not describe what I am seeing here ...... as I have no other services in use, just the Pidgin IM service.
I am able to use the services from a browser ..... such as IM and voice connection.
It seems thet Pidgin, from this morning, cannot get connected to the gmail account ...... "Not Authorised"
I have no changed anything in the account or in Pidgin, since yesterday, when it was working. It has been reliably working for a couple of years at least

The only thing I can think of is that some setting in the Gmail account itself, is preventing Pidgin from accessing it.
Pidgin works OK today with Yahoo ...... so it is just a Gmail thing.
Is there some setting in the Gmail Account settings which might affect this?
I have not been into those settings for years, so have no idea what might be there.
Thanks.
regards.