Cydia impactor recently started showing an error that look like this:
"http-win.cpp:160
Peer certificate cannot be authenticated with given CA certificates SSL certificate problem: self signed certificate in certificate chain."
Unfortunatly there is no response from saurik when he is going to fix cydia impactor with an update and he was offline for quite a long time, but don't lose your hopes yet!
If you happen to have a mac computer hanging around or the time to create a virtual machine you might be saved.Apprently this issue only appears in windows computers and cydia impactor works perfectly fine in a Mac.
So if you are desperate to get something reassigned on your iOS and you don't mind taking time to grab your mac or setting up a VM then you are in luck, otherwise you will just have to wait for a fix.That is, if there is a fix
Happy signing ?