Download a fresh gnutella.net host file from https://sabercathost.com/folder/117312/gnut_file and copy-paste the file into C:\Users\UserAccountName\AppData\Roaming\WireShare
Keep a copy of the file in case you need it over the next 12 months. After that if needed, download a fresh copy as it should have been updated by then.

Did you not use WireShare for a month or more?
I can't remember which WSHR version but bigjx decided to re-add the code to delete the gnutella.net file if WSHR has not been used for 28 or more days. I don't agree with his approach but that's it. His idea is that WSHR would then download hosts from web cache to create a fresh file but unfortunately the main webcache WSHR uses has been misbehaving over the past year.

Since WSHR last connected for you, have you installed or updated any security softwares? One of them might be blocking the connections.