Please help, unusual error on BT broadband

Hi all, sorry if this is not the right place but couldnt think of a more active place to seek advice. Got back from work today and bt broadand was giving a 403 error saying “descriptionaccess to the specified resources has been forbidded. Oracle GlassFish Server”.

Restarted the router a couple of times which has fixed it but after looking up glassfish it seems to be some kind of application server with no relation to BT so Im suspicious of how why this should cut off a home broadband network.

Does anyone have any ideas?

BT is using those servers.