marshmallow upgrade now no internet

[nicksuch]

I had the upgrade yesterday, I now cant get any internet, apps like facebook work but firefox doesnt

I just get the message

"The proxy server is refusing connections"

any ideas?

[BandOfBrothers]

If a phone is not behaving as it should after a firmware update then the next usual step is to create a back up to preserve the data in the phones storage memory and perform a factory reset which helps to clear out old redundant files.