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StefanC24
StefanC24
New Member
October 2, 2025
Question

I receive "Connection was terminated unexpectedly." when trying to connect via mobile Hotspot

  • October 2, 2025
  • 1 reply
  • 1095 views

Hi everybody,
when i try to connect with forticlient vpn i receive a "Connection was terminated unexpectedly."

this happens only in my personal hotspot (iphone; telekom). when i try it with a hotspot of my colleague (also iphone; telekom) it works. it also works within our companies wifi.

we are not connected to any VPN with our iPhones. apple private relay is also disabled

could any other iPhone setting cause that problem?

1 reply

adambomb1219
SuperUser
adambomb1219
SuperUser
October 2, 2025

Most likely CG-NAT getting in the way. What do the FortiGate logs say? Does the firewall even see the request? The carrier could also be blocking this. IKEv2?

    StefanC24
    StefanC24Author
    New Member
    October 7, 2025

    Thanks for your answer.

    Seems the issue is that i only get a IPv6 by my provider and cannot change it. With this the IPsec configuration is not working.. 

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