{"id":21097,"date":"2026-08-27T11:06:32","date_gmt":"2026-08-27T07:36:32","guid":{"rendered":"https:\/\/maralhost.com\/kb\/docs\/windows\/%d8%b9%db%8c%d8%a8%db%8c%d8%a7%d8%a8%db%8c-%d8%ae%d8%b7%d8%a7%db%8c-503-service-unavailable-%d8%af%d8%b1-iis\/"},"modified":"2026-08-27T13:06:01","modified_gmt":"2026-08-27T09:36:01","slug":"iis-503-service-unavailable","status":"publish","type":"docs","link":"https:\/\/maralhost.com\/kb\/articles\/windows\/iis-503-service-unavailable\/","title":{"rendered":"\u0639\u06cc\u0628\u200c\u06cc\u0627\u0628\u06cc \u062e\u0637\u0627\u06cc 503 Service Unavailable \u062f\u0631 IIS"},"content":{"rendered":"\n

\u062e\u0637\u0627\u06cc IIS 503 Service Unavailable<\/strong> \u0628\u0647 \u0627\u06cc\u0646 \u0645\u0639\u0646\u06cc \u0627\u0633\u062a \u06a9\u0647 Request \u0628\u0647 Server \u0631\u0633\u06cc\u062f\u0647\u060c \u0627\u0645\u0627 IIS \u062f\u0631 \u0622\u0646 \u0644\u062d\u0638\u0647 \u0646\u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u062f \u0633\u0631\u0648\u06cc\u0633 \u0645\u0648\u0631\u062f\u0646\u0638\u0631 \u0631\u0627 \u062f\u0631 \u0627\u062e\u062a\u06cc\u0627\u0631 Client \u0642\u0631\u0627\u0631 \u062f\u0647\u062f.<\/p>\n\n\n\n

\u062f\u0631 IIS \u06cc\u06a9\u06cc \u0627\u0632 \u0631\u0627\u06cc\u062c\u200c\u062a\u0631\u06cc\u0646 \u0639\u0644\u062a\u200c\u0647\u0627 \u0645\u062a\u0648\u0642\u0641 \u0628\u0648\u062f\u0646 Application Pool<\/strong> \u0627\u0633\u062a\u060c \u0627\u0645\u0627 \u062f\u0644\u06cc\u0644 \u062a\u0648\u0642\u0641 Pool \u0627\u0647\u0645\u06cc\u062a \u0628\u06cc\u0634\u062a\u0631\u06cc \u062f\u0627\u0631\u062f. Crash \u0634\u062f\u0646 Worker Process\u060c Rapid-Fail Protection\u060c \u0645\u0634\u06a9\u0644 Application Pool Identity\u060c \u067e\u0631 \u0634\u062f\u0646 Queue \u06cc\u0627 \u062d\u062a\u06cc \u0645\u062d\u062f\u0648\u062f\u06cc\u062a\u200c\u0647\u0627\u06cc Hosting \u0648 Suspend \u0634\u062f\u0646 Subscription \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u062f\u0631 \u0627\u06cc\u062c\u0627\u062f 503 \u0646\u0642\u0634 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u0646\u062f. Microsoft \u0628\u0631\u0627\u06cc \u0639\u06cc\u0628\u200c\u06cc\u0627\u0628\u06cc \u0627\u06cc\u0646 \u062e\u0637\u0627 \u0628\u0631\u0631\u0633\u06cc Substatus \u062f\u0631 IIS Logs \u0648 \u0647\u0645\u0686\u0646\u06cc\u0646 HTTPERR Logs \u0631\u0627 \u062a\u0648\u0635\u06cc\u0647 \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n\n\n\n

\n\n\n\n

\u0645\u0639\u0646\u06cc Substatus\u0647\u0627\u06cc \u0645\u0647\u0645 503<\/h1>\n\n\n\n

\u0627\u0648\u0644\u06cc\u0646 \u0642\u062f\u0645 \u0627\u06cc\u0646 \u0627\u0633\u062a \u06a9\u0647 \u0627\u0632 \u0631\u0648\u06cc IIS Logs \u0645\u0634\u062e\u0635 \u06a9\u0646\u06cc\u0645 \u062f\u0642\u06cc\u0642\u0627\u064b \u0628\u0627 \u06a9\u062f\u0627\u0645 \u0646\u0648\u0639 503 \u0631\u0648\u0628\u0647\u200c\u0631\u0648 \u0647\u0633\u062a\u06cc\u0645.<\/p>\n\n\n\n

\u06a9\u062f<\/th>\u0645\u0639\u0646\u06cc<\/th><\/tr><\/thead>
503.0<\/code><\/td>Application Pool \u062f\u0631 \u062f\u0633\u062a\u0631\u0633 \u0646\u06cc\u0633\u062a<\/td><\/tr>
503.2<\/code><\/td>Concurrent Request Limit \u0631\u062f \u0634\u062f\u0647 \u0627\u0633\u062a<\/td><\/tr>
503.3<\/code><\/td>ASP.NET Queue \u067e\u0631 \u0634\u062f\u0647 \u0627\u0633\u062a<\/td><\/tr>
503.4<\/code><\/td>FastCGI Queue \u067e\u0631 \u0634\u062f\u0647 \u0627\u0633\u062a<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Microsoft \u0627\u06cc\u0646 Substatus\u0647\u0627 \u0631\u0627 \u0628\u0631\u0627\u06cc IIS \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0631\u062f\u0647 \u0627\u0633\u062a.<\/p>\n\n\n\n

\u0628\u0631\u0627\u06cc \u0646\u062d\u0648\u0647 \u067e\u06cc\u062f\u0627 \u06a9\u0631\u062f\u0646 sc-status<\/code> \u0648 sc-substatus<\/code> \u0645\u0642\u0627\u0644\u0647 \u0628\u0631\u0631\u0633\u06cc IIS Logs \u0628\u0631\u0627\u06cc \u0639\u06cc\u0628\u200c\u06cc\u0627\u0628\u06cc \u0633\u0627\u06cc\u062a<\/a><\/strong> \u0631\u0627 \u0645\u0637\u0627\u0644\u0639\u0647 \u06a9\u0646\u06cc\u062f.<\/p>\n\n\n\n

\n\n\n\n

\u06f1. Application Pool \u0633\u0627\u06cc\u062a \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f<\/h1>\n\n\n\n

\u062f\u0631 \u0628\u0633\u06cc\u0627\u0631\u06cc \u0627\u0632 \u0645\u0648\u0627\u0631\u062f 503.0<\/code> \u0632\u0645\u0627\u0646\u06cc \u062f\u06cc\u062f\u0647 \u0645\u06cc\u200c\u0634\u0648\u062f \u06a9\u0647 Application Pool \u0633\u0627\u06cc\u062a \u0645\u062a\u0648\u0642\u0641 \u0634\u062f\u0647 \u0628\u0627\u0634\u062f.<\/p>\n\n\n\n

\u062f\u0631 IIS Manager<\/code> \u0648\u0627\u0631\u062f:<\/p>\n\n\n\n

Application Pools<\/code><\/pre>\n\n\n\n
\u0634\u0648\u06cc\u062f \u0648 Pool \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 \u0633\u0627\u06cc\u062a \u0631\u0627 \u067e\u06cc\u062f\u0627 \u06a9\u0646\u06cc\u062f.<\/p>\n\n\n\n
\u0627\u06af\u0631 \u0645\u0637\u0645\u0626\u0646 \u0646\u06cc\u0633\u062a\u06cc\u062f \u0633\u0627\u06cc\u062a \u0627\u0632 \u06a9\u062f\u0627\u0645 Pool \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc\u200c\u06a9\u0646\u062f:<\/p>\n\n\n\n
Sites\n> Website\n> Basic Settings<\/code><\/pre>\n\n\n\n
\u0631\u0627 \u0628\u0627\u0632 \u06a9\u0631\u062f\u0647 \u0648 \u0645\u0642\u062f\u0627\u0631:<\/p>\n\n\n\n
Application pool<\/code><\/pre>\n\n\n\n
\u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f.<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u0627\u06af\u0631 Pool \u062f\u0631 \u0648\u0636\u0639\u06cc\u062a:<\/p>\n\n\n\n
Stopped<\/code><\/pre>\n\n\n\n
\u0627\u0633\u062a\u060c \u0631\u0648\u06cc \u0622\u0646 \u0631\u0627\u0633\u062a\u200c\u06a9\u0644\u06cc\u06a9 \u06a9\u0631\u062f\u0647 \u0648:<\/p>\n\n\n\n
Start<\/code><\/pre>\n\n\n\n
\u0631\u0627 \u0627\u0646\u062a\u062e\u0627\u0628 \u06a9\u0646\u06cc\u062f.<\/p>\n\n\n\n
\u0633\u067e\u0633 Website \u0631\u0627 \u062f\u0648\u0628\u0627\u0631\u0647 \u062a\u0633\u062a \u06a9\u0646\u06cc\u062f.<\/p>\n\n\n\n
\n
\u0627\u06af\u0631 Application Pool \u062f\u0648\u0628\u0627\u0631\u0647 \u0628\u0644\u0627\u0641\u0627\u0635\u0644\u0647 Stop \u0634\u062f\u060c \u0635\u0631\u0641\u0627\u064b Start \u06a9\u0631\u062f\u0646 \u0622\u0646 \u0631\u0627\u0647\u200c\u062d\u0644 \u0646\u06cc\u0633\u062a. \u0628\u0627\u06cc\u062f \u0639\u0644\u062a \u062a\u0648\u0642\u0641 \u0631\u0627 \u067e\u06cc\u062f\u0627 \u06a9\u0646\u06cc\u062f.<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\n
\u06f2. \u0627\u06af\u0631 Application Pool \u062f\u0648\u0628\u0627\u0631\u0647 Stop \u0645\u06cc\u200c\u0634\u0648\u062f<\/h1>\n\n\n\n
\u06cc\u06a9\u06cc \u0627\u0632 \u0639\u0644\u062a\u200c\u0647\u0627\u06cc \u0645\u0647\u0645\u060c Rapid-Fail Protection<\/strong> \u0627\u0633\u062a.<\/p>\n\n\n\n
\u0627\u06af\u0631 Worker Process \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 Application Pool \u062f\u0631 \u06cc\u06a9 \u0628\u0627\u0632\u0647 \u06a9\u0648\u062a\u0627\u0647 \u0686\u0646\u062f \u0628\u0627\u0631 Crash \u06a9\u0646\u062f\u060c IIS \u0628\u0631\u0627\u06cc \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0627\u0632 Crash Loop \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u062f Application Pool \u0631\u0627 \u0627\u0632 \u0633\u0631\u0648\u06cc\u0633 \u062e\u0627\u0631\u062c \u06a9\u0646\u062f \u0648 Request\u0647\u0627 \u0628\u0627 503 \u067e\u0627\u0633\u062e \u062f\u0627\u062f\u0647 \u0634\u0648\u0646\u062f. Rapid-Fail Protection \u0628\u0647\u200c\u0635\u0648\u0631\u062a \u067e\u06cc\u0634\u200c\u0641\u0631\u0636 \u0641\u0639\u0627\u0644 \u0627\u0633\u062a.<\/p>\n\n\n\n
\u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0639\u0644\u062a \u0648\u0627\u0631\u062f:<\/p>\n\n\n\n
Event Viewer\n> Windows Logs\n> System<\/code><\/pre>\n\n\n\n
\u0634\u0648\u06cc\u062f.<\/p>\n\n\n\n
Event\u0647\u0627\u06cc\u06cc \u0628\u0627 Source\u0647\u0627\u06cc\u06cc \u0645\u0627\u0646\u0646\u062f:<\/p>\n\n\n\n
WAS<\/code><\/pre>\n\n\n\n
\u0631\u0627 \u062f\u0631 \u0632\u0645\u0627\u0646 \u0628\u0631\u0648\u0632 \u062e\u0637\u0627 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f.<\/p>\n\n\n\n
Microsoft \u0628\u0631\u0627\u06cc \u062a\u0634\u062e\u06cc\u0635 Crash \u0634\u062f\u0646 Worker Process \u0646\u06cc\u0632 \u0628\u0631\u0631\u0633\u06cc Event\u0647\u0627\u06cc WAS\u060c \u0627\u0632 \u062c\u0645\u0644\u0647 Event ID 5011<\/code>\u060c \u0631\u0627 \u067e\u06cc\u0634\u0646\u0647\u0627\u062f \u0645\u06cc\u200c\u06a9\u0646\u062f.<\/p>\n\n\n\n
\u0647\u0645\u0686\u0646\u06cc\u0646:<\/p>\n\n\n\n
Windows Logs\n> Application<\/code><\/pre>\n\n\n\n
\u0631\u0627 \u0628\u0631\u0627\u06cc Error\u0647\u0627\u06cc Application\u060c .NET \u06cc\u0627 Module\u0647\u0627\u06cc \u0633\u0627\u06cc\u062a \u0628\u0631\u0631\u0633\u06cc \u06a9\u0646\u06cc\u062f.<\/p>\n\n\n\n
\u062f\u0631 \u0628\u0633\u06cc\u0627\u0631\u06cc \u0627\u0632 \u0645\u0648\u0627\u0631\u062f \u0645\u06cc\u200c\u062a\u0648\u0627\u0646 \u0628\u0627 \u062a\u0646\u0638\u06cc\u0645 \u0646\u062d\u0648\u0647 \u06a9\u0627\u0631 IIS application pool \u0645\u0634\u06a9\u0644 \u0631\u0627 \u0628\u0647 \u0637\u0648\u0631 \u0645\u0648\u0642\u062a \u062d\u0644 \u06a9\u0631\u062f \u0648 \u0633\u067e\u0633 \u0628\u0627 \u0627\u0637\u0644\u0627\u0639 \u0631\u0633\u0627\u0646\u06cc \u0628\u0647 \u06a9\u0627\u0631\u0628\u0631 \u0628\u0631\u0627\u06cc \u0627\u0635\u0644\u0627\u062d \u062e\u0637\u0627\u0647\u0627 \u0645\u0634\u06a9\u0644 \u0631\u0627 \u0631\u06cc\u0634\u0647\u200c\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u06a9\u0631\u062f \u0648\u0644\u06cc \u062f\u0631 \u0639\u06cc\u0646 \u062d\u0627\u0644 \u0633\u0627\u06cc\u062a \u0646\u06cc\u0632 \u062f\u0631 \u062f\u0633\u062a\u0631\u0633 \u0642\u0631\u0627\u0631 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f.<\/p>\n\n\n\n
\u0628\u0631\u0627\u06cc \u0627\u06cc\u0646 \u0645\u0646\u0638\u0648\u0631 \u0628\u0627\u06cc\u062f \u0627\u0632 \u0645\u0646\u0648\u06cc \u0633\u0645\u062a \u0631\u0627\u0633\u062a \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 application pool \u06cc\u06a9 \u0648\u0628\u0633\u0627\u06cc\u062a advanced settings \u0631\u0627 \u0627\u0646\u062a\u062e\u0627\u0628 \u06a9\u0631\u062f \u0648 start mode \u0631\u0627 \u0631\u0648\u06cc AlwaysRunning \u0642\u0631\u0627\u0631 \u062f\u0627\u062f.<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\n\n\n\n
\u06f3. Rapid-Fail Protection \u0631\u0627 \u063a\u06cc\u0631\u0641\u0639\u0627\u0644 \u0646\u06a9\u0646\u06cc\u062f \u0645\u06af\u0631 \u0628\u0631\u0627\u06cc \u062a\u0633\u062a<\/h1>\n\n\n\n
\u062f\u0631:<\/p>\n\n\n\n
Application Pools\n> App Pool\n> Advanced Settings\n> Rapid-Fail Protection<\/code><\/pre>\n\n\n\n
\u062a\u0646\u0638\u06cc\u0645\u0627\u062a \u0645\u0631\u0628\u0648\u0637 \u0628\u0647 Failure \u062f\u0631 \u062f\u0633\u062a\u0631\u0633 \u0647\u0633\u062a\u0646\u062f.<\/p>\n\n\n\n
\u063a\u06cc\u0631\u0641\u0639\u0627\u0644 \u06a9\u0631\u062f\u0646 Rapid-Fail Protection \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0628\u0627\u0639\u062b \u0634\u0648\u062f Pool \u062f\u06cc\u06af\u0631 Stop \u0646\u0634\u0648\u062f\u060c \u0627\u0645\u0627 \u0639\u0644\u062a Crash \u0631\u0627 \u0628\u0631\u0637\u0631\u0641 \u0646\u0645\u06cc\u200c\u06a9\u0646\u062f<\/strong>.<\/p>\n\n\n\n
\u0627\u06af\u0631 Application \u0628\u0647\u200c\u0637\u0648\u0631 \u0645\u062f\u0627\u0648\u0645 Worker Process \u0631\u0627 Crash \u0645\u06cc\u200c\u06a9\u0646\u062f\u060c \u0628\u0627\u06cc\u062f \u0639\u0644\u062a \u0627\u0635\u0644\u06cc \u0645\u0627\u0646\u0646\u062f:<\/p>\n\n\n\n