My macbook pro 2012 can't connect recovery server.
I deleted my os file form my mac. When i try to reinstall my mac os i have see a error. Recovery server can't connect.
MacBook Pro 13″, macOS 10.13
AFAIK recovery server has been lately flaky. Download the desired macOS from the link below.
How to download and install macOS - Apple Support
Use another Mac, if necessary. Don't delete the last bootable volume before you have a backup plan...