Troubleshooting Tip: SSLVPND process crashes with Signal 11 (Segmentation fault) causing connections to drop

When the sslvpnd process crashes, causing some or all SSL VPN connection to go down, run the command below:

diagnose debug crashlog read
16287: 2026-01-27 14:03:14 <00396> firmware FortiGate-2000E v7.4.10,build2867b2867,260116 (GA.M) (Release)
16288: 2026-01-27 14:03:14 <00396> application sslvpnd
16289: 2026-01-27 14:03:14 <00396> *** signal 11 (Segmentation fault) received ***
16290: 2026-01-27 14:03:14 <00396> Register dump:
16291: 2026-01-27 14:03:14 <00396> RAX: 00007f75ad2a1930 RBX: 00007f75a58f60a0
16292: 2026-01-27 14:03:14 <00396> RCX: 0000000000007071 RDX: 000000000000250a
16293: 2026-01-27 14:03:14 <00396> R08: 0000000000000000 R09: 00007fffeb3627a0
16294: 2026-01-27 14:03:14 <00396> R10: 00007f7596db14d0 R11: 00007fffeb362e20
16295: 2026-01-27 14:03:14 <00396> R12: 00007fffeb3625f0 R13: 00007fffeb362780
16296: 2026-01-27 14:03:14 <00396> R14: 000000006978a982 R15: 00007f7596fca920
16297: 2026-01-27 14:03:14 <00396> RSI: 0000000000000004 RDI: 00007fffeb362780
16298: 2026-01-27 14:03:14 <00396> RBP: 00007fffeb362e80 RSP: 00007fffeb362460
16299: 2026-01-27 14:03:14 <00396> RIP: 00007f75a0440613 EFLAGS: 0000000000010246
16300: 2026-01-27 14:03:14 <00396> CS: 0033 FS: 0000 GS: 0000
16301: 2026-01-27 14:03:14 <00396> Trap: 000000000000000e Error: 0000000000000004
16302: 2026-01-27 14:03:14 <00396> OldMask: 0000000000000000
16303: 2026-01-27 14:03:14 <00396> CR2: 00007f75ad2a1954
16304: 2026-01-27 14:03:14 <00396> stack: 0x7fffeb362460 - 0x7fffeb3633e0
16305: 2026-01-27 14:03:14 <00396> Backtrace:
16306: 2026-01-27 14:03:14 <00396> [0x7f75a0440613] => /bin/sslvpnd {0x7f759ea7e000}
16307: 2026-01-27 14:03:14 <00396> [0x7f75a055f632] => /bin/sslvpnd {0x7f759ea7e000}
16308: 2026-01-27 14:03:14 <00396> [0x7f75a055dc38] => /bin/sslvpnd {0x7f759ea7e000}
16309: 2026-01-27 14:03:14 <00396> [0x7f75a051030c] => /bin/sslvpnd {0x7f759ea7e000}
16310: 2026-01-27 14:03:14 <00396> [0x7f75a05117e8] => /bin/sslvpnd {0x7f759ea7e000}
16311: 2026-01-27 14:03:14 <00396> [0x7f75a0511b23] => /bin/sslvpnd {0x7f759ea7e000}
16312: 2026-01-27 14:03:14 <00396> [0x7f75a0512287] => /bin/sslvpnd {0x7f759ea7e000}
16313: 2026-01-27 14:03:14 <00396> [0x7f759ed99133] => /bin/sslvpnd {0x7f759ea7e000}
16314: 2026-01-27 14:03:14 <00396> [0x7f759e107e1b] => /lib/libc.so.6 {0x7f759e0e4000}
16315: 2026-01-27 14:03:14 <00396> [0x7f759ed942fa] => /bin/sslvpnd {0x7f759ea7e000}
16316: 2026-01-27 14:03:14 <00396> fortidev 6.0.2.0008

In addition, gather the information below, and then open a ticket with TAC Support:

1. Configuration file.
2. TAC report.
3. System event logs.

Workaround:

This issue is triggered when Firewall policy time schedules are configured under SSLVPN policies. As a workaround, consider removing the schedules from the SSLVPN policies.

This issue has been resolved in FortiOS v7.6.

Note that starting in FortiOS 7.6.3, the SSL VPN tunnel mode feature is replaced with IPsec VPN. For more information, refer to Release Notes 7.6.3: SSL VPN tunnel mode replaced with IPsec VPN.