We are using an old version of OFTP Server (2013, build 89). We have recently started getting warnings that "Key1 will expire 10.august 2019". Key1 is a self signed certificate and I guess it is not used in production, but I need to make sure the system will not stop working. Can we safely ignore the warning? We are postponing OFTP upgrade as long as we can, why change a working system, right?