It seems to me that you’ve had your firewall on and blocked the outgoing connections to download precise orbit files from an external ftp site. Can you confirm that? If you do have a firewall on please try to close it and try again.
If it is still not working I will add a line in the code so that when returning such an error when connecting to external sites for downloading orbit file the code will then read the built-in orbit file from S1A SLC files.
The reason you get this error is because yesterday both of the server for downloading orbit files were shut down and (not start running yet but will be). (And also because there’s a bug in the code not considering fully this situation.)
One more word about S1A orbit file: In case there’s a connection error again in the future, all the orbit files for S1A is located in ORBITS/S1A/yyyy/mm/aux_zzzzzz/ where zzzzzz is [ poeorb | resorb ]. poeorb is the precise orbit and resorb is the restituted orbit. You can manually download them from https://qc.sentinel1.eo.esa.int/ if you want and place in the corresponding folder.