Cause (Documented platform behavior): NNE/checksumming only supported in Thick mode; older Thin versions surfaced it as connection closed.
Fix status: documented_behavior
Misleading approaches:
- Treating DPY-4011 as a network/firewall problem when NNE is required.
Limitations:
- Docs-derived; not reproduced.
- DPY-4011 also occurs for real connection drops and DB connection overload.
Other error fragments:
- DPY-4011: the database or network closed the connection
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/oracle/python-oracledb/4a6d3b393232f6c5d66a497b7d137aa427f289d8/doc/src/user_guide/troubleshooting.rst (official_docs, unknown, documented_behavior): DPY-3001 NNE: Thin doesn't support NNE; verify via v$session_connect_info; use TLS or Thick mode. DPY-4011: with python-oracledb 2 or earlier in Thin mode, common cause is NNE; also seen when DB can't handle connection count.
Search phrasings: DPY-3001 Native Network Encryption and Data Integrity is only supported in python-oracledb thick mode; DPY-4011 the database or network closed the connection thin mode; python-oracledb NNE thin
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Connect fails with DPY-3001 (current) or a confusing DPY-4011 closed-connection error (python-oracledb 2 or earlier).
- Context
- Product: python-oracledb Component: Thin mode network encryption Operation: Connecting to Oracle DBs configured with Native Network Encryption (SQLNET.ENCRYPTION_SERVER=required), common in enterprise/on-prem Affected versions: unknown Environment: unknown Packages: oracledb current (main) Trigger: Database has NNE or checksumming enabled; Thin mode doesn't implement NNE.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- DPY-3001: Native Network Encryption and Data Integrity is only supported in python-oracledb thick mode
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [python-oracledb Thin mode] 'DPY-3001: Native Network Encryption and Data Integrity is only supported in python-oracledb thick mode' (older versions: 'DPY-4011: the database or network c
Recommended action: Check `SELECT network_service_banner FROM v$session_connect_info`; switch the DB to TLS (supported in Thin and Thick) or enable Thick mode with Oracle Client libraries.
Option: Use TLS or Thick mode [evidence: official_recommended_action]
Applies when: See record scope.
Steps:
1. Ask DBA whether NNE is required; prefer TLS (tcps) connections
2. Or enable Thick mode: oracledb.init_oracle_client()
Expected: Command proceeds without the error.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- f6d8043e-a3cd-4da7-95e9-f8770d2435de
- Proposed action
- Recommended action: Check `SELECT network_service_banner FROM v$session_connect_info`; switch the DB to TLS (supported in Thin and Thick) or enable Thick mode with Oracle Client libraries. Option: Use TLS or Thick mode [evidence: official_recommended_action] Applies when: See record scope. Steps: 1. Ask DBA whether NNE is required; prefer TLS (tcps) connections 2. Or enable Thick mode: oracledb.init_oracle_client() Expected: Command proceeds without the error.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.