Migration nexus2 to nexus3 : http time out on repo-proxy

Hi,
I try to migrate nexu2 to Nexus3.
Everything is OK except one !!

when I try to upgrade te repo-proxy
registry.npmjs.org // https://registry.npmjs.org/

I have this error :

2023-11-22 13:23:00,116+0000 DEBUG [qtp476300995-84] admin com.sonatype.nexus.migration.ui.ProgressComponent - read SYNC
2023-11-22 13:23:01,132+0000 WARN  [plan-executor-11-thread-4] admin com.sonatype.nexus.migration.client.http.MonitoredHttpRetryHandler - Considering HTTP retry after 1 failures, most recent: Read timed out
2023-11-22 13:23:01,133+0000 WARN  [plan-executor-11-thread-4] admin com.sonatype.nexus.migration.client.http.MigrationRequestMonitorImpl - Request failed: Read timed out
2023-11-22 13:23:01,134+0000 INFO  [plan-executor-11-thread-4] admin com.sonatype.nexus.migration.client.http.MigrationRequestMonitorImpl - Delaying until Wed Nov 22 13:23:06 UTC 2023
2023-11-22 13:23:01,138+0000 DEBUG [qtp476300995-84] admin com.sonatype.nexus.migration.ui.ProgressComponent - read SYNC
2023-11-22 13:23:02,130+0000 DEBUG [qtp476300995-84] admin com.sonatype.nexus.migration.ui.ProgressComponent - read SYNC
2023-11-22 13:23:03,134+0000 DEBUG [qtp476300995-84] admin com.sonatype.nexus.migration.ui.ProgressComponent - read SYNC
2023-11-22 13:23:04,141+0000 DEBUG [qtp476300995-339] admin com.sonatype.nexus.migration.ui.ProgressComponent - read SYNC
2023-11-22 13:23:05,155+0000 DEBUG [qtp476300995-84] admin com.sonatype.nexus.migration.ui.ProgressComponent - read SYNC
2023-11-22 13:23:06,140+0000 INFO  [plan-executor-11-thread-4] admin org.apache.http.impl.execchain.RetryExec - I/O exception (java.net.SocketTimeoutException) caught when processing request to {tls}->http://proxy-prod.aixlan.local:8080->https://nexus.intra.monext.fr:10130: Read timed out
2023-11-22 13:23:06,141+0000 INFO  [plan-executor-11-thread-4] admin org.apache.http.impl.execchain.RetryExec - Retrying request to {tls}->http://proxy-prod.aixlan.local:8080->https://nexus.intra.monext.fr:10130
2023-11-22 13:23:06,162+0000 DEBUG [qtp476300995-84] admin com.sonatype.nexus.migration.ui.ProgressComponent - read SYNC

someone could help me ?
thx
Michel