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Vodafone Sure Signal

Sure Signal v1 Not Connecting

2: Seeker


Having problems with the Sure Signal v1 for over a week now. It constantly cycles through the same sequence of lights as follows:

- Solid 1
- Cycle through 1, 2, 3, and 4
- Solid 1
- Solid 1 and flashing 2
- Solid 1 and 2
- Solid 1 and 2 with 4 flashing
- Solid 1 and 2
- All off

And repeat ad infinitum.


I've been through the instructions in Resetting your Sure Signal  and I see the same behaviour. I've de-registered and re-registered the Sure Signal and received texts to indicate this has completed, but still not joy.


To try and track down what's going on I've run tcpdump on my broadband router and see the following:

- Sure Signal requests and receives time via NTP from
- Sure Signal sends IKE initialisation and authentication to (
- Sure Signal and ( commence IPSec ESP session over UDP port 4500
- Sure Signal sends UDP packets to on port 33434, 33435 and 33436
- Sure Signal sends IKE initialisation and authentication to
- Sure Signal and commence IPSec ESP session over UDP port 4500
- Sure Signal sends UDP packets to on port 33434, 33435 and 33436
- Sure Signal sends IKE initialisation and authentication to
- Sure Signal and commence IPSec ESP session over UDP port 4500
- Sure Signal sends UDP packets with TTL 4 to on port 33434.

- Sure Signal reboots and the above repeats


The UDP packets that are sent to ports 33434 etc., are kind of odd in that they all have a very low IP TTL of 4 and so never make it to the destination.


Not quite sure where to go after this. Any ideas greatly appreciated.



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17: Community Champion

Hi @smf22


It may also be worth trying a different power supply with the SureSignal (Version 1 & 2 ), even if it still looks ok regarding lights etc as there have been some reports of replacement power supplies solving the issues as they can degrade. They are available on eBay for around £10.


From member cineriv "But firstly, have a look around for a suitable unit with a 12 Volt output @ around 1.5Amp capacity that you could 'borrow' to prove the fault. Suitable units can be found on external hard drives, monitors, printers, routers etc.etc."


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If you're still experiencing problems using your Sure Signal @smf22, please try the steps in our troubleshooting guide.


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2: Seeker

Thanks Mark. Looking through the only one relevent is Light one on, light two flashing and...


- Wait 24 hours: Been over a week now.

- Check that your Sure Signal has registered successfully: Done, and as I mentioned I've received email notification to that effect.
- Manually configure your router to allow port-forwarding: Not needed, and again as I mentioned, I can see traffic with the tcpdump (network packet capture) to and from the IP addresses mentioned in the troubleshooting guide.


I've also been through the Resetting your Sure Signal and this has not helped either.



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Thanks for the update @smf22. So we can investigate your Sure Signal issue further, please complete our troubleshooting template and we be in touch soon.

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2: Seeker

Hi @Mark,

Requested details as follows:

The issue you’re experiencing:

Sure Signal v1 not connecting.

What light sequence you're seeing:
- Solid 1
- Cycle through 1, 2, 3, and 4
- Solid 1
- Solid 1 and flashing 2
- Solid 1 and 2
- Solid 1 and 2 with 4 flashing
- Solid 1 and 2
- All off
- And repeat

Your speed test results:


54.87             15.18           9          Eastbourne

Your external IP address:
86.X.Y.37 (obfuscated as public forum)


Your Sure Signal serial number:



smf22@host:~$ sudo traceroute
traceroute to (, 30 hops max, 60 byte packets
 1  erx1 (  0.399 ms  0.441 ms  0.339 ms
 2  * * *
 3  * * *
 4 (  8.376 ms  8.348 ms  8.338 ms
 5 (  10.334 ms (  7.883 ms (  8.554 ms
 6 (  8.732 ms (  10.119 ms (  9.987 ms
 7 (  9.959 ms (  9.338 ms (  8.816 ms
 8 (  9.645 ms  8.885 ms  8.706 ms
 9  * * *
10  * * *
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *

Note that whilst traceroute is being dropped traffic captured with tcpdump can be seen between the Sure Signal and the mentioned host

root@erx1:/home/smf22# tcpdump -n -i switch0.101 host
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on switch0.101, link-type EN10MB (Ethernet), capture size 262144 bytes
08:48:15.235674 IP > NONESP-encap: isakmp: child_sa  inf2[I]
08:48:15.248680 IP > NONESP-encap: isakmp: child_sa  inf2[R]
08:48:16.162216 IP > UDP-encap: ESP(spi=0xc698ad7b,seq=0x74b), length 132
08:48:16.165056 IP > UDP-encap: ESP(spi=0x3444343b,seq=0x74f), length 132
08:48:17.099609 IP > UDP-encap: ESP(spi=0x3444343b,seq=0x750), length 132
08:48:17.113140 IP > UDP-encap: ESP(spi=0xc698ad7b,seq=0x74c), length 132
08:48:20.908480 IP > UDP-encap: ESP(spi=0xc698ad7b,seq=0x74d), length 132
08:48:20.910541 IP > UDP-encap: ESP(spi=0x3444343b,seq=0x751), length 132
08:48:21.689217 IP > UDP-encap: ESP(spi=0x3444343b,seq=0x752), length 100
08:48:21.701919 IP > UDP-encap: ESP(spi=0xc698ad7b,seq=0x74e), length 100
08:48:25.919623 IP > UDP-encap: ESP(spi=0x3444343b,seq=0x753), length 132
08:48:25.932945 IP > UDP-encap: ESP(spi=0xc698ad7b,seq=0x74f), length 132
08:48:26.741794 IP > UDP-encap: ESP(spi=0xc698ad7b,seq=0x750), length 132


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Thank you for providing this information @smf22. The light sequence you've provided indicates your Sure Signal is struggling to maintain a connection to our network. I've requested this to be resynchronised, this can take 6 hours to complete. After this time restart you phone in range and your service will be restored.

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2: Seeker

I'll keep an eye and test this later. Thanks @Mark for your assistance with this.


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2: Seeker

Hi @mark,

It's been 24-hours now and still no joy with this. Turned phones off and on, Sure Signal off and on and also reset the Sure Signal.

The light sequence is repeating as before: 1 solid -> 1, 2, 3, 4 cycle -> 1 solid -> 1 solid, 2 flash -> 1 solid, 2 solid, 4 flash -> 1 solid, 2 solid -> 1 solid -> 1, 2, 3, 4 cycle.

Packet capture still shows the same: NTP to and, IKE to, or and UDP encapsulated ESP to, or

Getting pretty desperate now as there's no Vodafone signal in my house without the Sure Signal.


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@smf22 Thanks for updating us and I'm sorry to hear that the resync hasn't restored your service for you.

I've raised this with our technical team and they can see that there are multiple failures whe connecting to our servers. This would determine that the device is faulty and would need to be replaced.

If you'd prefer not to purchase a new Sure Signal to help improve your coverage at home, you do have the option to add Wi-Fi Calling to your price plan free of charge. This would allow you to make and receive calls through your Wi-Fi. 

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2: Seeker

Thanks @natasha for looking into this and your note on WiFi calling.

I'm interested to understand in what way "the device is faulty". Clearly the hardware is functional as the lights cycle through a seemingly known pattern. As for the software, well that would seem to be functional to. The device is able to boot the operating system and then use the  Dynamic Host Configuration Protocol to ask anyone on my LAN for an IP address. Once provided with an IP address it knows it needs to understand the time and so requests that via the Network Time Protocol (NTP). It also understands that it should use security when passing data across the Internet, and so using the Internet Key Exchange (IKEv2) Protocol and UDP Encapsulation of IPsec ESP Packets establishes a secure connection. And not only does it establish a secure connection, but it knows that's a Vodafone Sure Signal and so connects to Vodafone systems with the IP addresses and for NTP, and,,,, and for IPSec.

So it knows and is able to achieve all this whilst being faulty. That's truly amazing.

Perhaps it's not actually faulty at all, but Vodafone, despite their statements of supporting a 'low carbon economy' and empowering 'customers to make more sustainable choices about the products' would rather I simply throw the thing away and buy another one. Solves the problem, and puts more money into the Vodafone coffers at the same time.

But of course... I forgot. I don't need a functioning Sure Signal. I can add WiFi calling to my plan free of charge. But alas no as the the phones I have don't support WiFi calling. No problem I'll throw those into the same bin as the Sure Signal and buy models that do support WiFi calling.

Seems to me the best course of action is to move provider to one that can give me the service I pay for.

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