XiovV

I have been using xpenology for about a month now and everything worked perfectly fine, after a 7 day vacation i turn the server on and I cant connect to my server, does anyone know why? I didnt update it I didnt do anything, it was sitting there for 7 days straight and for some reason it stopped working. I also think it boots up how it should but it just doesnt want to connect. EDIT: The reason why i couldn't connect is because the IP changed