[INFO] fetching crate ipopt-sys 0.5.4...
[ERROR] this task or one of its parent failed!
[ERROR] https://static.crates.io/crates/ipopt-sys/ipopt-sys-0.5.4.crate: an IO error occurred: Connection reset by peer (os error 104)
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.