This article describes possible reason why there would be "HTTPS request failed" when connecting JSC.

If a loopback interface is configured as an external interface in Internet Key Exchange (IKE) gateway and there are one or more loopback addresses configured without an IPv6 address configured against it, remote access solution will not work, and Juniper Secure Connect (JSC) will report an "HTTPS request failed" error.

This issue might be seen if following conditions are met:

* On all SRX platforms* Loopback interface is configured as external interface in IKE gateway and there are multiple loopback addresses configured in SRX or SRX has only one loopback configured and IPv6 address is not configured to it

Workaround:

Configure only one loopback address and ensure it has both IPv4 and IPv6 addresses configured.

Fix is committed on:

junos:21.4R3-S9 junos:22.2R3-S5 junos:22.3R3-S4 junos:22.4R3-S5 junos:23.2R2-S3 junos:23.4R2-S5 junos:24.2R2 junos:24.3R1 junos:24.4R1