Hi New Soft,

The message states that a request forwarded to the Remote Adapter during the process of subscribing an Item, does not receive a reply (by the Remote Adapter) within the timeout defined.

Please consider that the default value (configured in adapters.xml <param name="timeout">10000</param>) is 10 seconds, so if you have not changed it, the subscribe method may last up to 10 seconds for each Item required otherwise a timeout exception will be raised on the Proxy Adapter side.
Timed out requests are considered as failed and later answers are ignored, this can lead the clients to looping of retry attempts.

Please you should check your remote adapter behavior in order to investigate why it takes so long to process subscribe requests. Please note that a subscribe reply should just acknowledge the request, and should not be waiting for data from external sources.

Finally, if the scenario arises only from momentary burst of requests, you may try to increase the timeout on requests.

Regards,
Giuseppe