Failure Signature
UAExpert fails while connecting to the NI OPC UA Server. The client reports BadOutOfMemory, and the same status is returned during CreateSession. This establishes the failure stage, but it does not prove that the client computer or server computer has exhausted physical memory.
| Evidence | Engineering conclusion |
|---|---|
BadOutOfMemory |
An out-of-memory status was returned; the underlying cause is not confirmed. |
Error returned during CreateSession
|
The connection attempt reached OPC UA session creation before failing. |
| No server version, configuration, or resource data supplied | The affected release and exact corrective action remain unknown. |
Likely Fault Domain
The available evidence points to the NI server application as the primary fault domain, but this remains a hypothesis rather than a confirmed root cause. Do not interpret the status alone as proof of operating-system memory depletion; the evidence contains no memory measurements, server logs, firmware or software version, or configuration details.
Diagnostic Procedure
- Record both reported messages exactly:
BadOutOfMemoryandBadOutOfMemoryreturned duringCreateSession. - Check the NI OPC UA Server application for diagnostic information corresponding to that connection attempt. Preserve any server-side message that occurs at session creation.
- Identify the installed NI server product and software version. The supplied evidence does not establish either value, so version-specific conclusions are not justified.
- Use the applicable National Instruments documentation or official support channel to interpret the server-side result and determine whether the installed version has a documented correction or configuration requirement.
Verification Criteria
After applying guidance specific to the identified NI product and version, reconnect with UAExpert. Verify that CreateSession completes without BadOutOfMemory. If the error remains, retain the exact client message, matching server diagnostics, product identification, and software version for escalation through the official NI support channel.
FAQ
Why does UAExpert return BadOutOfMemory during CreateSession?
The evidence confirms that the status is returned during session creation, but it does not identify the underlying cause. The NI server application is the primary component to investigate.
Does BadOutOfMemory prove the NI server has no free RAM?
No. No resource measurements or server diagnostics were supplied, so physical memory exhaustion cannot be concluded from the status alone.
How do I verify the NI OPC UA Server connection is fixed?
Reconnect with UAExpert and confirm that CreateSession completes without BadOutOfMemory. If it fails again, correlate the client error with server diagnostics from the same attempt.
