Resolving the Subscribe to data error Agilent 7890 GC Chromperfect
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If your Agilent 7890 Gas Chromatograph shows Ready in Chromperfect, you start a run, but no chromatogram appears — and after about a minute you see the error “Subscribe to Data” — this guide explains what’s happening and how to fix it.
What Causes the Subscribe to data error Agilent 7890 GC Chromperfect
This issue is not caused by Chromperfect. In fact, the software successfully sends the start signal to your GC. The problem occurs when Windows or a security program blocks the return data ports, preventing Chromperfect from receiving the chromatogram data.
It’s not a configuration error within Chromperfect — if you can download a method and start a run, your setup is correct. The issue lies within your PC or network environment.
Steps to Resolve the Error
1. Confirm the Symptom
Start an acquisition that normally displays a live chromatogram.
If the GC stays in Ready, no trace appears, and the error shows after roughly one minute — continue to the next step.
2. Set the Network to Private or Work
On Windows 11:
Go to Settings → Network & Internet
Select your active connection → Network Profile → Choose Private
If your PC has multiple network cards (e.g., Ethernet and Wi-Fi), make sure the card connected to the GC is set to Private.
3. Allow Chromperfect Programs Through Windows Firewall
Permit both of these applications through Windows Firewall:
Chromperfect Acquisition Client
Chromperfect Acquisition Service
If missing, add them manually from your Chromperfect installation folder.
4. Check Required Ports
For the Agilent 7890 GC, the following ports must be open:
9100
12300
7990–8000 (a range of 10 consecutive ports)
If your IT policies restrict ports, you may need their assistance to open these both inbound and outbound.
5. Review Third-Party Security Software
Products such as Norton, AVG, Avast, or similar may block traffic even when Windows Firewall allows it.
Temporarily disable protection and test again. If this resolves the issue, re-enable protection and create exceptions for the Chromperfect programs and required ports.
6. Disable Unused Network Adapters
If your PC is connected via Ethernet, turn off Wi-Fi and any unused adapters under Settings → Network & Internet. Mixed connections can cause routing conflicts that block return data.
7. Verify the Chromperfect Acquisition Service
Open Services.msc and check that the Chromperfect Acquisition Service is running.
If stopped, start it. If running, restart it.
8. Ask IT to Verify Network Policy
If the problem persists, your IT department must ensure the return data port is open end-to-end between the GC and the PC, with no network device or firewall blocking it.
Final Check
After the ports are open, start another acquisition.
If the chromatogram draws immediately, your system is fixed.
Re-enable any protections that were temporarily disabled.
Summary
The Subscribe to data error Agilent 7890 GC Chromperfect is almost always a network communication issue, not a Chromperfect fault. Following the above steps will resolve the vast majority of cases without needing software reconfiguration.
For further help, watch the full video walkthrough on our YouTube channel:
And for more training and support content, visit:
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