Symptoms:

java.io.IOException: Server returned HTTP response code: 605 ...

Calling node receives a network service code 605 is unable to push or pull data.

Explanation:

This can occur for a variety of reasons is the original request was received by the destination node but the connection was lost to the caller at some point while servicing the original request.

Below are some ways the original request could be disrupted.

if the request times out, a restart of the source node, or the network interrupted the connection. Any of these would result in the caller making a new request and receiving the 605 until the original request completes.

• A network timeout
• Restarting the calling SymmetricDS instance
• Firewall

Solutions:

• Adjust network timeouts
• Expect this error after a restart if a request was in process while restarting. It will recover.
• Adjust firewall rules or settings that may cancel the request after so much time or data sent.
• Reduce batch sizes (configure -> channel -> max batch size) to reduce the time it takes to send batches of data and avoid timeouts and network restrictions.