AT&T's mobile hotspot service is reported to be incompatible with FortiClient IPsec VPN, with commenters suggesting the provider is known for blocking IKE tunnels on some services.

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    "summary": "AT&T's mobile hotspot service is reported to be incompatible with FortiClient IPsec VPN, with commenters suggesting the provider is known for blocking IKE tunnels on some services.",
    "category": "reliability",
    "comments": [
      {
        "url": "https://www.reddit.com/r/fortinet/comments/1ww8ee7/comment/pdis1mv/",
        "depth": 0,
        "score": 12,
        "author": "Kuro_z",
        "excerpt": "is the Cisco AnyConnect also using IPsec, or is it using SSL VPN?",
        "posted_at": "2026-10-03T00:31:02.000Z",
        "author_url": "https://www.reddit.com/user/Kuro_z/"
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      {
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        "depth": 0,
        "score": 12,
        "author": "ring_of_slattern",
        "excerpt": "Have you tried disabling IPv6?\n\n https://community.fortinet.com/support-forum-92/forticlient-vpn-is-stuck-at-98-when-connected-to-iphone-hotspot-111093",
        "posted_at": "2026-10-03T00:47:40.000Z",
        "author_url": "https://www.reddit.com/user/ring_of_slattern/"
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      {
        "url": "https://www.reddit.com/r/fortinet/comments/1ww8ee7/comment/pdjg8vg/",
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        "author": "Noname_Nets",
        "excerpt": "AT&T (and a few other providers) have been known to block IKE tunnels on some of their services. It'd be worth a call to ask them. If they are blocking IKE you can ask them to remove the block. Annoying, but have had to make that call more than once.",
        "posted_at": "2026-10-03T02:54:00.000Z",
        "author_url": "https://www.reddit.com/user/Noname_Nets/"
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        "author": "General_NakedButt",
        "excerpt": "https://community.fortinet.com/fortigate-3/technical-tip-how-to-use-tcp-as-transport-for-ike-ipsec-traffic-159945\n\n You could try running IPSec over TCP 443, should get around any weird ISP blocking.",
        "posted_at": "2026-10-03T06:00:13.000Z",
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        "author": "HappyVlane",
        "excerpt": "What troubleshooting have you done?",
        "posted_at": "2026-10-03T06:37:49.000Z",
        "author_url": "https://www.reddit.com/user/HappyVlane/"
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      {
        "url": "https://www.reddit.com/r/fortinet/comments/1ww8ee7/comment/pdjeyy4/",
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        "author": "clayko",
        "excerpt": "We had similar issues with ATT and t mobile as service provider . The odd part was it was just certain ATT services . We just moved users to different VPN cause we could figure out why",
        "posted_at": "2026-10-03T02:46:12.000Z",
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        "url": "https://www.reddit.com/r/fortinet/comments/1ww8ee7/comment/pdjtmxc/",
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        "author": "Net_Owl",
        "excerpt": "Enable NAT-T for the IPsec tunnel. UDP port 4500 instead of 500.",
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        "author": "That_Fixed_It",
        "excerpt": "The only I could get this working for everyone was to configure IPsec over TCP as a fallback. You can download a 30-day trial of the latest FortiClient if you want to test it.",
        "posted_at": "2026-10-03T01:36:23.000Z",
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      "[post] FortiClient VPN... fails to connect when I'm on my AT&T mobile hotspot.",
      "[comment u/Noname_Nets] AT&T (and a few other providers) have been known to block IKE tunnels on some of their services. It'd be worth a call to ask them. If they are blocking IKE you can ask them to remove the block.",
      "[comment u/clayko] We had similar issues with ATT and t mobile as service provider ."
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    "post_text": "Hi all, looking for some ideas on this one.\n\nFortiClient VPN connects fine from my home network and other home networks, but it fails to connect when I'm on my AT&T mobile hotspot. On the same hotspot and the same laptop, Cisco AnyConnect connects and works without any issues, so it doesn't seem like AT&T is blocking VPN traffic in general.\n\nSetup:\n\nFortiClient 7.4.3, IPsec IKEv2 with EAP\n\nWindows laptop",
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