I decided to dive into this by Googling `"error 0x08" openconnect`, and found many more examples of the same "error 0x08" in response to the Juniper "vestigial auth packet." None of them seem to have been resolved. I don't see any notable commonalities among the reports either. I am cc'ing Andrew Tsvetinskiy, Nate Mow, Pete Flugstad, F?lix Defrance, and Oleg Fominykh? because they all reported matching failures on this list in the past. I'm intensely curious to know if any of them ever figured out how to connect to their Juniper VPNs using OpenConnect. ? Cases reported on the mailing list: - http://lists.infradead.org/pipermail/openconnect-devel/2015-March/002820.html (Oleg Fominykh) - http://lists.infradead.org/pipermail/openconnect-devel/2015-August/003132.html (Nate Mow) - http://lists.infradead.org/pipermail/openconnect-devel/2015-November/003253.html (Pete Flugstad) - http://lists.infradead.org/pipermail/openconnect-devel/2017-April/004259.html (F?lix Defrance) - http://lists.infradead.org/pipermail/openconnect-devel/2017-July/004404.html (Andrew Tsvetinskiy) - http://lists.infradead.org/pipermail/openconnect-devel/2018-August/005037.html (Brandon Liles) Two more examples from around the web: - https://pastebin.com/MpjJPuGJ (sdceng01 at sdcportal.sdc.se) - https://www.reddit.com/r/debian/comments/6wqqaf/pulse_secure_on_debian_91/dmbmvse Dan