[blinki bill]

Before starting from scratch you may contact you hosting support, is quite likely that they changed something on the server configuration lately without letting you know and that change stops your script of working properly

I suppose that your script tries to open the link that is being submitted and if it uses fopen() to do that and they restricted "fopen" of opening nonlocal files(which is something that almost all the host do last 2-3 years due to security reasons) the script may think that the link is not accessible