Error: Failed to create the group. Check your server logs for more information.

Sometimes Confluence fails to create a group with the error message described in the summary.

After trying multiple times it works without any problem after a few minutes.

I could find following entry in the log files:

013-05-21 14:56:36,980 ERROR [http-80-8] [confluence.user.actions.BrowseGroupsAction] doAdd Failed to create group: xy
– url: /admin/users/creategroup.action | userName: xy | referer: http://xy.com/admin/users/browsegroups.action | action: creategroup
com.atlassian.confluence.user.UserManagementOperationFailedException: java.net.ConnectException: Connection refused: connect
at com.atlassian.confluence.user.DefaultUserAccessor.createGroup(DefaultUserAccessor.java:293)

Do you have any advice?