Unable to selfupdate; rsync command works outside of ports

[adam.attarian@…]

Greetings. When I try to self update ports, I receive and HTTP error message:

[09:45 user@host ~] > sudo port -v selfupdate ---> Updating MacPorts base sources using rsync rsync: server sent "HTTP/1.0 500 handshakefailed" rather than greeting rsync error: error starting client-server protocol (code 5) at /SourceCache/rsync/rsync-45/rsync/main.c(1398) [receiver=2.6.9] Command failed: /usr/bin/rsync -rtzv --delete-after rsync://rsync.macports.org/release/tarballs/base.tar /opt/local/var/macports/sources/rsync.macports.org/release/tarballs Exit code: 5 Error: Error synchronizing MacPorts sources: command execution failed Error: /opt/local/bin/port: port selfupdate failed: Error synchronizing MacPorts sources: command execution failed sent 36 bytes received 69 bytes 70.00 bytes/sec

The rsync command works outside of the selfupdate:

[09:45 user@host-mitll ~] > sudo /usr/bin/rsync -rtzv --delete-after rsync://rsync.macports.org/release/tarballs/base.tar /opt/local/var/macports/sources/rsync.macports.org/release/tarballs

receiving file list ... done total size is 27013120 speedup is 257267.81 `

I am behind a proxy:

[09:52 user@host-mitll ~] > sudo env | grep http http_proxy=​http://xxx.xxx.xxx.xxx:8080

https_proxy=​http://xxx.xxx.xxx.xxx:8080

Any ideas? Apologies for the formatting; I couldn't get the wikiFormatting to do its thing. Basically, the rsync command doesn't work within selfupdate, but does if I just do it manually. This complicates my debugging.