<div>
check the firewall if any enabled on your wireless router ? or check the logs... <br />
<br />
on router <br />
<br />
all the best
</div>


check the firewall if any enabled on your wireless router ? or check the logs...

on router

all the best

<div>
Cellular connections can have some restrictions if the telco thinks it's necessary. Please ask the support desk if they know of any firewall rule regarding this VPN connection.<br />
<br />
If telco not helpful, change to L2TP/IPSEC VPN instead.
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Cellular connections can have some restrictions if the telco thinks it's necessary. Please ask the support desk if they know of any firewall rule regarding this VPN connection.

If telco not helpful, change to L2TP/IPSEC VPN instead.

<div>
I have a HUAWEI USB Stick and I had to add VPN service from the ISP (modest charge). <br />
<br />
Try a standard Wi-Fi connection and see if that works?<br />
<br />
Also, your cellular connection introduces a double NAT, so make sure Synology VPN works for this. I use NCP Secure Entry to ensure double NAT connections can be traversed.
</div>


I have a HUAWEI USB Stick and I had to add VPN service from the ISP (modest charge).

Try a standard Wi-Fi connection and see if that works?

Also, your cellular connection introduces a double NAT, so make sure Synology VPN works for this. I use NCP Secure Entry to ensure double NAT connections can be traversed.

<div>
It works with every other connection except cellular [Verizon] <br />
Please give more details on how to deal with double NAT or how to test if this is the issue.
</div>


It works with every other connection except cellular [Verizon]
Please give more details on how to deal with double NAT or how to test if this is the issue.

<div>
You need to ask you ISP about putting a VPN point on your cellular account. &nbsp;I had to do that and VPN then works fine.
</div>


You need to ask you ISP about putting a VPN point on your cellular account.  I had to do that and VPN then works fine.

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<div class="content wysiwyg-content">
I am using Synology VPN [open vpn] to connect my laptop which uses a cellular connection to my office network, suddenly, it fails to connect with the following errors<br />
&nbsp;LS key negotiation failed to occur within 60 seconds (check your network connectivity)<br />
TLS handshake failed<br />
Still, if I connect my laptop with a wired connection it connects no problem.
</div>
</div>


I am using Synology VPN [open vpn] to connect my laptop which uses a cellular connection to my office network, suddenly, it fails to connect with the following errors
 LS key negotiation failed to occur within 60 seconds (check your network connectivity)
TLS handshake failed
Still, if I connect my laptop with a wired connection it connects no problem.

VPN connection fails over cellular connection [worked till now]

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.

Network Security

cellular

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.