Skip to content
07944 877 329 hello@solar-tech-support.co.uk
Alectrona Get a quote
Problem diagnosis · Victron Energy

Victron VRM Portal Offline — Cerbo GX WiFi, Ethernet & Token Diagnosis

Your Victron VRM portal is showing the system offline — you can't monitor battery state of charge, inverter output, or solar yield remotely. The Cerbo GX (or Venus GX) has lost its connection to Victron's cloud servers. This is almost always a local network issue rather than a VRM server problem.
from £195 on-site WiFi setup · extender £75 extra if needed
Start diagnosis
  • The step-by-step guide is free to follow
  • VRM access token renewal
  • Venus OS update guidance
Lost remote access to your Victron system?

Follow the free step-by-step guide on this page. If it still won't connect, we set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting. If it's the VRM token or registration rather than the connection, our free remote diagnostic covers it.

Book on-site WiFi setupBack to Victron hub

Independent — not affiliated with Victron Energy.

5.0
Rated 5.0 on Google Read all 151 reviews

I contacted Solar Tech Support because I had a problem with my legacy GiveEnergy installation. within 24 hours they had diagnosed the problem and offered advice on resolution. Because they were unable to fix the problem there was no charge! This despite numerous time consuming emails. I am currently trying to engage with the original installer but if that is unsuccessful I will go back to Solar Tech Support and ask them to repair the system with a retrofit. Very knowledgeable and responsive. I highly recommend them.

Tim Hatt · Aug 2026 Google

⭐⭐⭐⭐⭐ 5-Star Review – Solar Tech Support Installing solar panels is only the first step! To get the best possible performance and maximise your investment, you need to make sure your system is configured correctly and all settings are properly optimised. **Solar Tech Support did exactly that for me, and I couldn't be happier with their professional service!** Their knowledge, expertise, and attention to detail helped me optimise my solar system to get the most out of it. If you already have solar panels and battery storage, I highly recommend contacting Solar Tech Support for professional advice, system optimisation, and technical support. Don't just install solar panels – make sure you're getting the maximum benefit from your investment! ⭐⭐⭐⭐⭐ Highly recommended! Thank you, Solar Tech Support, for your excellent service!

Karolis Bagdonas · Oct 2026 Trustpilot

Ron dealt with a battery issue within an hour on a weekend remotely. Very clear instructions to fix the issue worked first time. Excellent service.

Si Whaley · Aug 2026 Google

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration. So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

Fantastic service, I would highly recommend. From first contact my solar issue was resolved within 2 days. Wouldn't use anyone else.

Jackie Howell · Jul 2026 Google

My GivEnergy solar and battery system is failing intermittently, GivEnergy is in administration and so is my installer, so it was a relief to get Ron’s expert advice.

Steve Trossell · Jun 2026 Google

Written by · Independent Solar Engineer Last updated

What is VRM? VRM (Victron Remote Management) is Victron's cloud monitoring portal at vrm.victronenergy.com. It connects to your system via a GX device — typically a Cerbo GX, Venus GX, or Cerbo-S GX — which sends data over your local internet connection. VRM shows real-time battery state of charge, solar yield, grid consumption, inverter status, and alarm history. When the GX device loses connectivity, VRM shows the system as offline and you lose all remote monitoring and control.

Diagnostics

5-step VRM offline diagnosis

VRM offline means the Cerbo GX cannot reach Victron's cloud servers. You lose remote visibility and control, but the system usually keeps running, so check the inverter's own screen or the GX display. Work through these steps to restore the connection.

1

Check the Cerbo GX network status on the local display or VictronConnect

Access the Cerbo GX directly — either via the touchscreen display (if fitted) or by connecting to it with VictronConnect over Bluetooth. Navigate to Settings → Ethernet/WiFi:

IP address interpretation
Valid IP (e.g. 192.168.1.x): The device is connected to your local network. The issue is between the network and VRM (skip to step 4).
0.0.0.0: No connection at all. The WiFi or Ethernet interface is not linked to the router.
169.254.x.x: DHCP failure — the Cerbo GX is connected to the router but did not receive an IP address. The router's DHCP server may be full or disabled.

The Cerbo GX uses Ethernet by default when both WiFi and Ethernet are connected. Disconnecting the Ethernet cable forces it to WiFi.

2

Diagnose WiFi signal strength and router connectivity

The Cerbo GX has a small internal antenna — WiFi signal quality is the single most common cause of VRM dropout:

• Signal threshold: Anything below -80 dBm is unreliable. Below -85 dBm the Cerbo GX will drop frequently. Check the signal strength on the local display under Settings → WiFi.
• Common weak-signal locations: Garages, lofts, outbuildings, and metal-clad plant rooms. The internal antenna struggles through thick walls, foil-backed insulation, and metal enclosures.
• Password change: If the router was recently updated by the ISP or the WiFi password was changed, the Cerbo GX will fail silently. Re-enter the new password on the Cerbo GX.
• Best fix: Run a wired Ethernet cable to the Cerbo GX if at all possible. This eliminates WiFi-related dropouts permanently.

If Ethernet is not feasible, a dedicated WiFi access point or mesh node within 5 metres of the Cerbo GX is the next best option. If the signal still won't reach, we can fit a WiFi extender on site: our WiFi setup visit is from £195, and the extender is an extra £75.

3

Verify Ethernet DHCP or static IP configuration

If you're using Ethernet but the Cerbo GX still shows no connection or 0.0.0.0, check these common failure points:

Ethernet troubleshooting checklist
Cable: Reseat both ends. Try a different cable. Check the router port link light — it should be solid or blinking.
DHCP: Confirm DHCP is enabled on the Cerbo GX (Settings → Ethernet). Most home routers assign IPs automatically.
Static IP conflict: If a static IP was set, verify no other device on the network uses the same address. Check the subnet mask (usually 255.255.255.0), gateway (your router's IP), and DNS (try 8.8.8.8 as a test).
Managed switches: Some enterprise or managed switches block unknown MAC addresses. Add the Cerbo GX MAC to the allowed list or move it to an unmanaged switch port.

After any change, give the Cerbo GX 60 seconds to establish a new connection. Venus OS network changes are not instant.

4

Check the VRM access token and portal registration

If the Cerbo GX has a valid IP address but VRM still shows offline, the issue is between the device and Victron's cloud:

• VRM portal status: On the Cerbo GX, go to Settings → VRM online portal. It should say "Connected". If it shows "Error" or "Connection error", the access token has expired or the device is not registered correctly.
• Re-register the device: Note the VRM portal ID from the Cerbo GX (a long alphanumeric string). Log into vrm.victronenergy.com, navigate to the installation's Settings → General, remove the device, and re-add it using the portal ID. This forces a new access token.
• Account transfer: If the system was transferred between owners or VRM accounts and the old owner did not release the device, it may still be registered under their account. Contact Victron support to transfer ownership.
• Two-way verification: After re-registering, check both the Cerbo GX display (should now show "Connected") and the VRM portal (should show the system as online within 2 minutes).

VRM access tokens do not expire on their own under normal operation. Token errors usually indicate the device was removed from VRM, re-flashed, or transferred between accounts.

5

Update Venus OS and verify outgoing port access

Older Venus OS versions have known connectivity bugs. An update is often the final fix for persistent VRM dropout:

• Check version: Settings → Firmware on the Cerbo GX shows the current Venus OS version. Compare against Victron's changelog for the latest release.
• Online update: If the Cerbo GX has intermittent connectivity, trigger the update during a connected period. Settings → Firmware → Online updates → Check for updates.
• USB update: If fully offline, download the firmware file from Victron's website onto a FAT32-formatted USB drive. Insert into the Cerbo GX and follow the on-screen prompts.
• Firewall check: VRM uses HTTPS on port 443. If your router or firewall blocks outgoing connections from unknown devices, add the Cerbo GX MAC address to the allowed list. Some ISP-provided routers have parental controls that restrict new devices by default.

A quick firewall test: temporarily connect the Cerbo GX via a mobile phone hotspot. If VRM connects immediately, the issue is with your main router or firewall. See our VictronConnect & VRM setup guide for initial configuration walkthrough.

Why VRM connectivity matters more than people think

Many Victron owners treat VRM as a nice-to-have monitoring dashboard. In practice, VRM is far more important than that. On systems running ESS (Energy Storage System) mode, VRM carries dynamic grid setpoints from Victron's servers — if your electricity tariff uses time-of-use pricing (like Octopus Agile or Intelligent Go), the system needs VRM connectivity to receive updated charge and discharge schedules. Without VRM, the system falls back to its local default settings, which may not match your tariff windows.

VRM also provides remote firmware updates, alarm notifications (email and push), and two-way remote control — you can change ESS settings, adjust charge parameters, and restart devices from anywhere. For off-grid systems in remote locations, VRM is often the only way to know the system is working correctly. Losing VRM doesn't stop the hardware from operating, but it removes your ability to detect early warning signs — a slowly failing battery cell, a degrading MPPT controller, or a creeping firmware bug — before they become full system faults.

Related Victron problems
Useful guides
FAQ

VRM portal offline — common questions

Intermittent VRM disconnections are almost always caused by WiFi signal issues. The Cerbo GX has a small internal antenna that struggles with weak signals — anything below -80 dBm causes dropout. Router firmware updates that change the WiFi password, ISP equipment swaps, and DHCP lease expiry are other common triggers. Switching to a wired Ethernet connection is the most reliable permanent fix.
A 169.254.x.x address means the Cerbo GX attempted to get an IP via DHCP but the router did not respond. Common causes are a faulty Ethernet cable, a full DHCP pool, or the router's DHCP server being disabled. Check the cable, restart the router, or manually assign a static IP on the Cerbo GX.
Download the latest Venus OS firmware from Victron's website onto a FAT32-formatted USB drive. Insert it into the Cerbo GX USB port and navigate to Settings → Firmware. The device will detect the update file. Follow the on-screen prompts — the Cerbo GX restarts automatically after the update. Do not remove the USB drive or power during the process.
Not the WiFi. The Cerbo GX display or VictronConnect over Bluetooth shows you whether it's the WiFi, the Ethernet or the VRM token, and the steps on this page take you through each one. If the Cerbo GX needs reconnecting to your WiFi, we can set it up on site, from £195: we connect it to your WiFi, set up your router, including a separate 2.4 GHz network if it needs one, and check it's reporting. We don't set up or diagnose WiFi remotely or over the phone: it's quicker and more reliable done on site. If the Cerbo GX has a valid IP address but VRM still shows it offline, the issue is between the network and VRM (steps 4 and 5): the VRM token and registration are account work, and our free remote diagnostic covers them.
On the Cerbo GX, go to Settings → VRM online portal. If it shows "Connection error" but the device has a valid IP, outbound traffic is likely blocked. VRM uses HTTPS on port 443. Check your router firewall settings and parental controls. A quick test: connect the Cerbo GX via a mobile phone hotspot — if VRM connects immediately, the issue is your main router configuration.
Book

Still can't get VRM back online?

Tell us your Cerbo GX connection type and what the IP address shows. If you've worked through the steps on this page and the Cerbo GX still won't stay on your WiFi, we can set it up on site, from £195. If the signal doesn't reach, a WiFi extender is an extra £75, and we carry them with us. If it's the VRM registration or Venus OS, our free remote diagnostic covers it.

  • No fix, no fee covers remote fixes. On-site work is quoted in writing before we start.
  • On-site WiFi setup, from £195
  • Venus OS diagnosis included

By submitting you agree to be contacted about your diagnostic request. We don't share your data with 3rd parties.

Call 07944 877 329 Book free diagnostic