After the check for errors phase, we proceed to the "Review your migration" phase, and this is where the problem happens. The estimated time keeps forever spinning, if I leave and let CCMA working, it will show a connection error eventually.

17-Aug-2022 00:25:36.452 WARNING [Catalina-utility-4] org.apache.catalina.valves.StuckThreadDetectionValve.notifyStuckThreadDetected Thread [http-nio-8090-exec-23 url: /rest/migration/latest/stats/usersGroups; user: gmuller] (id=[799]) has been active for [67,496] milliseconds (since [8/17/22 12:24 AM]) to serve the same request for [http://34.211.15.211:8090/rest/migration/latest/stats/usersGroups] and may be stuck (configured threshold for this StuckThreadDetectionValve is [60] seconds). There is/are [18] thread(s) in total that are monitored by this Valve and may be stuck.
java.lang.Throwable
at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:106)

2022-08-09 16:33:19,921 ERROR [http-nio-8079-exec-4639] [[Standalone].[localhost].[/wiki].[servlet-module-container-servlet]] log Servlet.service() for servlet [servlet-module-container-servlet] threw exception
 -- referer: https://mana.mozilla.org/wiki/pages/viewpage.action?pageId=119683146 | url: /wiki/download/attachments/119683146/clg1.jpg | traceId: fbe931307b7bef1e | userName: dacoleman@mozilla.com
java.lang.RuntimeException: org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe
	at com.atlassian.confluence.image.effects.ImageFilterServlet.uncheckAndIgnoreClientAbortExceptions(ImageFilterServlet.java:471)
	at com.atlassian.confluence.image.effects.ImageFilterServlet.lambda$doGet$0(ImageFilterServlet.java:150)
	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:21)
	at com.atlassian.sal.spring.component.SpringHostContextAccessor.lambda$doInTransaction$0(SpringHostContextAccessor.java:70)
	at ...
com.atlassian.confluence.image.effects.ImageFilterServlet.lambda$doGet$0(ImageFilterServlet.java:148)
	... 510 more
Caused by: java.io.IOException: Broken pipe
	at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
	at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
	at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
	at sun.nio.ch.IOUtil.write(IOUtil.java:65)
	at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
	at org.apache.tomcat.util.net.NioChannel.write(NioChannel.java:138)
	at org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:101)
	at org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:152)
	at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1252)
	at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:764)
	at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:584)
	at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:528)
	at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:538)
	at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:84)
	at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:190)
	at org.apache.coyote.Response.doWrite(Response.java:601)
	at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:339)
	... 525 more