IPSEC VPN fail on Slingshot ?

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xpd

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#324990 23-Jun-2026 11:31

Got a user on Slingshot fibre who for some reason cannot use our VPN. Is a managed laptop, running same setup as the other 100 odd, VPN works everywhere, except their home connection.

Is a standard Slingshot supplied router.

They click connect on the client (Forticlient fwiw), it sits there for a moment, then gives a timeout message and drops.

From the gateway/server side, we can see the client connecting, tunnel goes up, then goes down as if the client has requested a disconnect.

Any ideas ? As mentioned, seems to work fine on other ISPs etc

XPD / Gavin

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#3505416 23-Jun-2026 11:37

Have they disabled port filtering in the Slingshot user panel and tried?

Long shot but might be worth a try

xpd

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#3505418 23-Jun-2026 11:39

Didnt know they did port filtering :D Thanks, will take a look at that.

XPD / Gavin

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#3505422 23-Jun-2026 11:50

Someone else is using src port udp 500/4500 on the same CG Nat pool at them and their connection is trying to do the same meaning connection tracking is lost

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.

xpd

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#3505430 23-Jun-2026 12:20

No change, same issue. Poo. :D

Will get them to contact Slingshot support and see if theres something else at play.

XPD / Gavin

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#3505443 23-Jun-2026 13:02

And is the router configured to allow VPN Passthrough? Something like checking the appropriate boxes:

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xpd

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#3505446 23-Jun-2026 13:13

Leaving it with the user and Slingshot, done all I can from my end. I don't want to start playing with a users home network :)

XPD / Gavin

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#3505620 23-Jun-2026 19:04

Few years ago had a user with a similar problem except using Contact, was never able to figure out what caused it

Had them get a Static to get around CGNat, no change. Other VPNs in the house worked fine

Eventually moved them to Cloudflare Warp with tunneling, pro went away

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#3505656 23-Jun-2026 21:58

Been a while since I've used fortinet but is their home IP range different to work?

Also, unrelated to this fault but please search for yourself here: FortiBleed — 73,932+ Compromised Fortinet Firewalls | Hudson Rock | Hudson Rock

You're not on Atlantis anymore, Duncan Idaho.

xpd

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#3505678 24-Jun-2026 07:07

Turns out that their router is over 10 years old, so Slingshot sending them a new one. Will test with that and go from there :)

And yes, I'm well aware of Fortibleed - I'm the one who posted about it on GZ :D

Thanks all :)

XPD / Gavin

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#3505690 24-Jun-2026 08:47

xpd:

Turns out that their router is over 10 years old, so Slingshot sending them a new one.

Oh dear lol

Any views expressed on these forums are my own and don't necessarily reflect those of my employer.

xpd

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#3506170 26-Jun-2026 06:56

New router resolved issue :)

XPD / Gavin

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