OID purge changelog fail or hang issue using comand remtool

oracle documentation about purging changelog fail issue

Problem

A remtool query such as

remtool -pdispqstat -v -bind host:port 

hangs. During the hang, attempts to bind to the server with other tools might fail.

Solution

If there is a large backlog of changelogs waiting to be purged, the remtool search query runs for a long time. Ensure that changelog purging is configured appropriately for your environment. See "Change Log Purging".
You can also increase the number of worker threads so that other tools can bind while remtool is running the query. See "Attributes of the Instance-Specific Configuration Entry" and the Oracle Internet Directory chapter in Oracle Fusion Middleware Performance and Tuning Guide.