How to Fix 503 Service Temporarily Unavailable Error in NGINX

503 Service Temporarily Unavailable Error means that NGINX is unable to handle the request as it is temporarily overloaded or facing resource ... Togglenavigation Builddashboards&reportsinminutes Features Pricing Blog WhatisUbiq FreeTrial Sometimesyoumayget503ServiceTemporarilyUnavailableerrorinNGINXduetovariousreasons.Inthisarticlewewilllookatwhatis503servicetemporarilyunavailableerror,andhowtofix503servicetemporarilyunavailableerrorinNGINX.   Whatdoes503ServiceTemporarilyUnavailableErrorinNGINX 503ServiceTemporarilyUnavailableErrormeansthatNGINXisunabletohandletherequestasitistemporarilyoverloadedorfacingresourceconstraints.Itisdifferentfrom500internalservererrorwheretheserverissimplyunabletoprocessyourrequest.Inthiscase,theservercontinuestofunctionproperlybuthaschosentoreturn503errorcode. BonusRead:HowtoFix500InternalServerErrorinNGINX   HowtoFix503ServiceTemporarilyUnavailableErrorinNGINX Hereishowtofix503servicetemporarilyunavailableerrorinNGINX.   1.RebootNGINXServer Oneoftheeasiestwaystofix503servicetemporarilyunavailableerroristosimplyrestartNGINXserver.Manytimes,NGINXmaygetoverloadedduetotoomanyopenconnectionsandtemporaryfiles.Restartingyourserverwillclosealltheseopenconnectionsanddeletetemporaryfilesthatarecausingthebottleneck.IfNGINXisareverseproxywithmultiplewebservers,makesuretorebooteventhewebserversdownthechaintoensurethatyourwebsite/applicationiscompletelyrefreshed. BonusRead:HowtoFix504GatwewayTimeoutErrorinNGINX   2.CheckforUnexpectedUpdates/Maintenance Haveyouenabledauto-updatesinyourwebsite/application?Ifso,thenitmightbedownloading/installingupdatesforoneormoreplugins.ThisisquitecommoninCMSbasedsystemslikeWordPressandMagento.Insuchcases,justturnoffauto-updatesinyoursystem. Similarly,checkifyouhaveanyscheduledmaintenancerunninginthebackground.Insuchcasesalso,yourwebserverwillreturn503servicetemporarilyunavailable. BonusRead:HowtoFix502BadGatewayinNGINX   3.ServerConnectivity NGINXmayalsothrow503servicetemporarilyunavailableerrorifitisunabletoconnecttothewebserver(e.gApache)oranyofthethird-partyAPIs. Sincetoday’swebarchitecturerequiresmultiplewebserversandthird-partyservices,NGINXislikelytogive503servicetemporarilyunavailableifanyofthemgoesdown.Insuchcasescheckifallwebserversandthirdpartyservicesareupandrunning. BonusRead:HowtoIncreaseRequestTimeoutinNGINX   4.ExamineServerLogs NGINXserverlogrecordstheIPaddress,device,requestedURL,responsecodeanddatetimeforeachrequest.YoucanuseanyserverlogmonitoringtooltofindoutwhichrequestedURLgives503servicetemporarilyunavailableerror.OnceyouhaveidentifiedtheproblematicURLs,youcaninvestigatefurtherintotheunderlyingcause. BonusRead:HowtoIncreaseFileUploadSizeinNGINX   5.ApplicationBugs Basedonpreviousstep,onceyouhaveidentifiedtherequestedURLsthatreturn503servicetemporarilyunavailableerror,lookforbugsincodeorscriptthatservethoseURLs.Lookintoyourversioncontrolsystem’scommithistoryforanyrecentmodificationstothecodethatservesthoseURLs.Thiswillhelpyouidentifyandfixproblemsquickly. Hopefully,theabovetipswillhelpyoufix503servicetemporarilyunavailableerrorinApache.   Ubiq makesiteasytovisualizedatainminutes,andmonitorinreal-timedashboards. Tryit Today! Relatedposts:HowToConfigureNGINXLogRotationHowtoSetupNGINXVirtualHostsonCentOSHowtofixNGINX:workerconnectionsarenotenoughHowToIncreaseFileUploadSizeinNGINXAboutAuthorAboutUbiqUbiqisapowerfuldashboard&reportingplatformforsmall&mediumbusinesses.Builddashboards,charts&reportsforyourbusinessinminutes.Getinsightsfromdataquickly.Tryitforfreetoday! Postnavigation HowtoListFilesinLinuxHowtoListAllFilesinaDirectoryinLinux AboutUsUbiqisabusinessintelligence&reportingtoolforsmall&mediumbusinesses.Buildbusinessdashboards,charts&reportsinminutes.Getinsightsfromdataquickly.Tryitforfree!