Bad response code and client and website appear down

any tips on how to solve these errors

bad response code and client and website appear down

http-tx-mgr.c(1261): Bad response code for GET https://
xx.xx.xx.xx/seafhttp/protocol-version: 503.

libcurl failed to GET https:// xx.xx.xx.xx/seafhttp/protocol-version: Couldn’t connect to server.