Our productive Gluu server shows up a strange behavior while users log in and out. The corresponding log message at oxtrust.log is as follows: ``` Caused by: org.gluu.site.ldap.exception.ConnectionException: Failed to lookup entry --> The connection to server localhost:1636 was closed while waiting for a response to search request SearchRequest(baseDN='inum=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31!0003!B2BA.B01D,ou=groups,o=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31,o=gluu', scope=BASE, deref=NEVER, sizeLimit=1, timeLimit=0, filter='(objectClass=*)', attrs={}): An I/O error occurred while trying to read the response from the server: IOException(message='The element indicated that it required 20971553 bytes to hold the value, but this is larger than the maximum of 20971520 bytes that the client has been configured to accept.', trace='readLength(ASN1StreamReader.java:390) / beginSequence(ASN1StreamReader.java:918) / readLDAPResponseFrom(LDAPMessage.java:1146) / run(LDAPConnectionReader.java:251)', revision=24201) at org.gluu.site.ldap.OperationsFacade.lookup(OperationsFacade.java:574) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.LdapEntryManager.find(LdapEntryManager.java:297) ~[oxcore-ldap-3.1.5.Final.jar:?] ... 84 more Caused by: com.unboundid.ldap.sdk.LDAPSearchException: The connection to server localhost:1636 was closed while waiting for a response to search request SearchRequest(baseDN='inum=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31!0003!B2BA.B01D,ou=groups,o=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31,o=gluu', scope=BASE, deref=NEVER, sizeLimit=1, timeLimit=0, filter='(objectClass=*)', attrs={}): An I/O error occurred while trying to read the response from the server: IOException(message='The element indicated that it required 20971553 bytes to hold the value, but this is larger than the maximum of 20971520 bytes that the client has been configured to accept.', trace='readLength(ASN1StreamReader.java:390) / beginSequence(ASN1StreamReader.java:918) / readLDAPResponseFrom(LDAPMessage.java:1146) / run(LDAPConnectionReader.java:251)', revision=24201) at com.unboundid.ldap.sdk.SearchRequest.process(SearchRequest.java:1221) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.LDAPConnection.search(LDAPConnection.java:3635) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.LDAPConnection.getEntry(LDAPConnection.java:1712) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.AbstractConnectionPool.getEntry(AbstractConnectionPool.java:611) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.AbstractConnectionPool.getEntry(AbstractConnectionPool.java:581) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at org.gluu.site.ldap.OperationsFacade.lookup(OperationsFacade.java:569) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.LdapEntryManager.find(LdapEntryManager.java:297) ~[oxcore-ldap-3.1.5.Final.jar:?] ... 84 more 2022-08-12 15:13:47,870 ERROR [qtp804611486-4611] [org.gluu.oxtrust.service.scim2.Scim2UserService] (Scim2UserService.java:353) - Failed to find entry: inum=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31!0003!B2BA.B01D,ou=groups,o=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31,o=gluu org.gluu.site.ldap.persistence.exception.EntryPersistenceException: Failed to find entry: inum=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31!0003!B2BA.B01D,ou=groups,o=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31,o=gluu at org.gluu.site.ldap.persistence.LdapEntryManager.find(LdapEntryManager.java:303) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.AbstractEntryManager.find(AbstractEntryManager.java:444) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.AbstractEntryManager.find(AbstractEntryManager.java:381) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.AbstractEntryManager.find(AbstractEntryManager.java:370) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.LdapEntryManager$Proxy$_$$_WeldClientProxy.find(Unknown Source) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.oxtrust.ldap.service.GroupService.getGroupByDn(GroupService.java:270) ~[classes/:?] at org.gluu.oxtrust.service.scim2.Scim2UserService.transferAttributesToUserResource(Scim2UserService.java:340) [classes/:?] at org.gluu.oxtrust.service.scim2.Scim2UserService.searchUsers(Scim2UserService.java:549) [classes/:?] at org.gluu.oxtrust.ws.rs.scim2.UserWebService.searchUsers(UserWebService.java:209) [classes/:?] at org.gluu.oxtrust.ws.rs.scim2.UserWebService$Proxy$_$$_WeldSubclass.searchUsers(Unknown Source) [classes/:?] at org.gluu.oxtrust.service.scim2.interceptor.UserWebServiceDecorator.searchUsers(UserWebServiceDecorator.java:172) [classes/:?] at sun.reflect.GeneratedMethodAccessor649.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181] at org.jboss.weld.annotated.runtime.InvokableAnnotatedMethod.invokeOnInstance(InvokableAnnotatedMethod.java:86) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.bean.proxy.DecoratorProxyMethodHandler.doInvoke(DecoratorProxyMethodHandler.java:78) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.bean.proxy.DecoratorProxyMethodHandler.doInvoke(DecoratorProxyMethodHandler.java:67) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.interceptor.util.proxy.TargetInstanceProxyMethodHandler.invoke(TargetInstanceProxyMethodHandler.java:33) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.bean.proxy.TargetBeanInstance.invoke(TargetBeanInstance.java:91) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:106) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.gluu.oxtrust.ws.rs.scim2.UserWebService$Proxy$_$$_Weld$Proxy$.searchUsers(Unknown Source) [classes/:?] at sun.reflect.GeneratedMethodAccessor648.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181] at org.jboss.weld.interceptor.proxy.TerminalAroundInvokeInvocationContext.proceedInternal(TerminalAroundInvokeInvocationContext.java:51) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.interceptor.proxy.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:78) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.gluu.oxtrust.service.scim2.interceptor.ReferenceURIInterceptor.manage(ReferenceURIInterceptor.java:67) [classes/:?] at sun.reflect.GeneratedMethodAccessor315.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181] at org.jboss.weld.interceptor.reader.SimpleInterceptorInvocation$SimpleMethodInvocation.invoke(SimpleInterceptorInvocation.java:73) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.executeAroundInvoke(InterceptorMethodHandler.java:84) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.executeInterception(InterceptorMethodHandler.java:72) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.interceptor.proxy.InterceptorMethodHandler.invoke(InterceptorMethodHandler.java:56) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler.invoke(CombinedInterceptorAndDecoratorStackMethodHandler.java:81) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.jboss.weld.bean.proxy.CombinedInterceptorAndDecoratorStackMethodHandler.invoke(CombinedInterceptorAndDecoratorStackMethodHandler.java:68) [weld-core-impl-3.0.5.Final.jar:3.0.5.Final] at org.gluu.oxtrust.ws.rs.scim2.UserWebService$Proxy$_$$_WeldSubclass.searchUsers(Unknown Source) [classes/:?] at org.gluu.oxtrust.ws.rs.scim2.UserWebService$Proxy$_$$_WeldClientProxy.searchUsers(Unknown Source) [classes/:?] at sun.reflect.GeneratedMethodAccessor647.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181] at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:236) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:406) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:213) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:228) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51) [resteasy-jaxrs-3.0.24.Final.jar:3.0.24.Final] at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [servlet-api-3.1.jar:3.1.0] at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865) [jetty-servlet-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655) [jetty-servlet-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:215) [websocket-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar:9.4.12.v20180830] at org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:226) [rewrite-servlet-3.4.2.Final.jar:3.4.2.Final] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533) [jetty-servlet-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) [jetty-security-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1340) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) [jetty-servlet-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) [jetty-server-9.4.12.v20180830.jar:9.4.12.v201 at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1242) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) [jetty-server-9.4.12.v20180830.jar:9.4.12.v201808 at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220) [jetty-server-9.4.12.v20180 at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126) [jetty-server-9.4.12.v20180830.jar:9.4.12 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [jetty-server-9.4.12.v20180830.jar:9.4.12.v2018 at org.eclipse.jetty.server.Server.handle(Server.java:503) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) [jetty-server-9.4.12.v20180830.jar:9.4.12.v20180830 at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305) [jetty-io-9.4.12.v20180830.jar:9.4. at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) [jetty-io-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) [jetty-io-9.4.12.v20180830.jar:9.4.12.v20180830] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) [jetty-util-9.4.12.v20180830.jar:9.4.12. at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) [jetty-util-9.4.12.v20180830.jar:9.4.1 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) [jetty-util-9.4.12.v20180830.jar:9.4. at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) [jetty-util-9.4.12.v20180830.jar:9.4.12.v201 at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) [jetty-util-9.4.12.v20 at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765) [jetty-util-9.4.12.v20180830.jar:9.4.12.v20180 at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683) [jetty-util-9.4.12.v20180830.jar:9.4.12.v201808 at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181] Caused by: org.gluu.site.ldap.exception.ConnectionException: Failed to lookup entry --> The connection to server localhost:1636 was closedrchRequest(baseDN='inum=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31!0003!B2BA.B01D,ou=groups,o=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31,o=gluu', scoper='(objectClass=*)', attrs={}): An I/O error occurred while trying to read the response from the server: IOException(message='The elemed the value, but this is larger than the maximum of 20971520 bytes that the client has been configured to accept.', trace='readLength(ASN1ader.java:918) / readLDAPResponseFrom(LDAPMessage.java:1146) / run(LDAPConnectionReader.java:251)', revision=24201) at org.gluu.site.ldap.OperationsFacade.lookup(OperationsFacade.java:574) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.LdapEntryManager.find(LdapEntryManager.java:297) ~[oxcore-ldap-3.1.5.Final.jar:?] ... 87 more Caused by: com.unboundid.ldap.sdk.LDAPSearchException: The connection to server localhost:1636 was closed while waiting for a response to C5.DA68.427A!0001!E8C1.AA31!0003!B2BA.B01D,ou=groups,o=@!3F52.C0C5.DA68.427A!0001!E8C1.AA31,o=gluu', scope=BASE, deref=NEVER, sizeLimit=1, An I/O error occurred while trying to read the response from the server: IOException(message='The element indicated that it required 209han the maximum of 20971520 bytes that the client has been configured to accept.', trace='readLength(ASN1StreamReader.java:390) / beginSeqFrom(LDAPMessage.java:1146) / run(LDAPConnectionReader.java:251)', revision=24201) at com.unboundid.ldap.sdk.SearchRequest.process(SearchRequest.java:1221) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.LDAPConnection.search(LDAPConnection.java:3635) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.LDAPConnection.getEntry(LDAPConnection.java:1712) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.AbstractConnectionPool.getEntry(AbstractConnectionPool.java:611) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at com.unboundid.ldap.sdk.AbstractConnectionPool.getEntry(AbstractConnectionPool.java:581) ~[unboundid-ldapsdk-3.2.0.jar:3.2.0] at org.gluu.site.ldap.OperationsFacade.lookup(OperationsFacade.java:569) ~[oxcore-ldap-3.1.5.Final.jar:?] at org.gluu.site.ldap.persistence.LdapEntryManager.find(LdapEntryManager.java:297) ~[oxcore-ldap-3.1.5.Final.jar:?] ... 87 more ``` How can we increase the maximum allowed value for read LDAP responses?