Why comes 405 - Method Not Allowed at user directories sync with jira?

[Steffen Stamprath]

When I try manually sync the user directories in confluence (Data Center 7.19.17) with jira since yesterday it comes this error:

HTTP Status 405 - Method Not Allowed

URL: /plugins/servlet/embedded-crowd/directories/sync?directoryId=XXXXXX

In the atlassian log I see this details:

WARN [http-nio-8090-exec-14] [servlet.mvc.support.DefaultHandlerExceptionResolver] logException Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'GET' not supported] -- referer: XXXXXX/plugins/servlet/embedded-crowd/directories/list | url: /plugins/servlet/embedded-crowd/directories/sync | traceId: 6fb8ca5c5dc31499 | userName: XXXXXXXX

Before yester day everything works fine. I use this function often.

We not install an plugin or update the system.

But why comes this error? Anybody an idea?

Thanks!