Rest Api & Curl Error 28

I have this Problem with my WordPress Site.
My Host is SITEGROUND.
When I Test my Site Health the Result Is:

La richiesta alla REST API è fallita a causa di un errore.
Errore: [] cURL error 28: Operation timed out after 10004 milliseconds with 0 bytes received.

La richiesta di loopback al tuo sito non è andata buon fine, questo significa che le caratteristiche che dipendono da questo non funzionano correttamente.
è stato riscontrato un errore: (0) cURL error 28: Operation timed out after 10004 milliseconds with 0 bytes received

And my Host report this Error:

[Thu Sep 05 21:00:41.245732 2019] [authz_core:error] [pid 43196] [client 192.0.91.164:39242] AH01630: client denied by server configuration: /home/reside08/public_html/xmlrpc.php, referer: https://www.residenzeparadiso.com/xmlrpc.php

[Thu Sep 05 20:34:53.664292 2019] [authz_core:error] [pid 50591] [client 192.0.86.139:53836] AH01630: client denied by server configuration: /home/reside08/public_html/xmlrpc.php, referer: https://www.residenzeparadiso.com/xmlrpc.php

[Thu Sep 05 20:30:45.876065 2019] [authz_core:error] [pid 29638] [client 192.0.88.90:36622] AH01630: client denied by server configuration: /home/reside08/public_html/xmlrpc.php, referer: https://www.residenzeparadiso.com/xmlrpc.php

How Can I Solve It?
Thanks

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