SatyamSingh The "http://repo.packagist.org/p/provider-2016%249570a6bfc5405b01b053fcdab5c2149e5907bdec619eee51dea199e09df22a80.json" file could not be downloaded: failed to open stream: Connection timed out http://repo.packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date
clarkwinkelmann SatyamSingh did composer previously worked fine on the same server ? It could be just a temporary error while connecting to their service.
clarkwinkelmann SatyamSingh what kind of server/hosting are you using ? Did they provide Composer to you or did you install Composer yourself ?
clarkwinkelmann SatyamSingh is it a VPS ? Can you try reaching other external urls from the server ? Maybe outbound requests are blocked by some firewall rules ?
clarkwinkelmann SatyamSingh please answer my questions above. We need more details on what kind of hosting you are using.
BlackSheep I can't even access his hoster from my home, as stated by @gozen it seems to be a network issue. Please contact your hoster about it. Also, can you test if composer is working as intended as requested by @clarkwinkelmann previously ?