HV00KERRORTier 2 — Caution✅ HIGH confidence

fdw_reply_handle

Category: Foreign Data Wrapper ErrorVersions: PostgreSQL 9.1+

What this means

A foreign data wrapper encountered an error with the reply handle used to receive results from a remote server, indicating a protocol or communication failure.

Why it happens

1Remote server closed the reply channel unexpectedly
2FDW internal reply handle was not properly initialised before use
3Network interruption during result retrieval from remote server
4FDW code bug — reply handle lifecycle error

How to reproduce

Fetching rows from a foreign table when remote communication fails mid-stream

trigger — this will ERROR

SELECT * FROM foreign_table;  -- remote disconnects during fetch

ERROR: HV00K: fdw_reply_handle

Fix 1: Check remote server connectivity

Remote server connection dropped mid-query

fix

SELECT dblink_connect('myconn', 'host=remotehost dbname=mydb user=myuser');

Why this works

Confirms the remote server is reachable and accepting connections

What not to do

✗

Do not retry without diagnosing root cause

Why it's wrong: Repeated failures may indicate a persistent network or server issue

Sources

📚 Official docs: https://www.postgresql.org/docs/current/fdw-error-handling.html

🔧 Source ref: https://www.postgresql.org/docs/current/errcodes-appendix.html

Confidence assessment

✅ HIGH confidence

Standard FDW error code from official PostgreSQL appendix.