We recently installed a MX250, and are having a similar issue only with our Dell Thin Clients.  This is the only post I have found that comes close to our issue.  Unfortinately the Thin clients run ThinOS that has AnyConnect already installed, and cannot be edited.   Cisco Tech did not find anything, and Dell is currently working on the issue.  These are the errors we are seeing, anyone else have an issue with these Dell Thin Clients with an MX250.   2024-12-11 08:59:06.321:err: Got inappropriate HTTP CONNECT response: HTTP/1.1 401 Unauthorized 2024-12-11 08:59:06.322:err: Creating SSL connection failed 2024-12-11 08:59:06.322:err: Cookie was rejected by server; exiting. ... View more