由于包超时，Eclipse内容辅助的问题花费的时间太长

我在eclipse代码内容辅助方面遇到了长时间的延迟，因为包含的包已经不存在了。我尝试了很多事情都没有成功。任何人都可以帮助解决这个问题，或者建议如何删除对坏包的引用

包裹是

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在窗口>首选项：安装/更新>可用软件站点中，您可以禁用或删除不再可用的更新站点。但我不知道这和内容辅助有什么关系。这不是因为另一个问题。很抱歉给你带来了混乱

at java.net.Socket.connect(Unknown Source)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:120)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:179)
at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:328)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:612)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:447)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:884)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.eclipse.ecf.provider.filetransfer.httpclient4.HttpClientFileSystemBrowser.runRequest(HttpClientFileSystemBrowser.java:263)
at org.eclipse.ecf.provider.filetransfer.browse.AbstractFileSystemBrowser$DirectoryJob.run(AbstractFileSystemBrowser.java:69)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)

!SUBENTRY 1 org.eclipse.equinox.p2.transport.ecf 4 1002 2018-06-22 11:21:27.761 
!MESSAGE Unable to connect to repository http://download.eclipse.org/webtools/downloads/drops/R3.8.1/R-3.8.1-20160912100321/repository/content.xml !STACK 0 java.net.ConnectException: Connection timed out: connect at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)