Rsync connection failures for rsync protocol version 2.6.9 (macOS default).

[PhotonCompute]

As of today, I am seeing rsync connection failures for outbound connections using the macOS default version of rsync:

% /usr/bin/rsync -rtzvl --delete-after rsync://mse.uk.rsync.macports.org/rsync.macports.org/release/tarballs/ .
rsync(59262): error: connect: Resource temporarily unavailable
rsync(59262): error: inet_connect

The error is evident in connection requests to other sites.

Connections are possible using newer versions of rsync, thus:

% /opt/local/bin/rsync -rtzvl --delete-after rsync://mse.uk.rsync.macports.org/rsync.macports.org/release/tarballs/ .
-----------------------------------------------------------------------------
Welcome to the University of Kent's UK Mirror Service.

The service provider may have made changes to their systems, but I was wondering if anyone else is seeing this issue?

[PhotonCompute · Accepted solution]

This problem arose due to the known problem in the uint32_t timer wrap bug in XNU.

It is a problem that will affect macOS users if their system has been up for more than 49 days.

It will impact all network connections, not just rsync.

The problem can be avoided by a reboot.

Further details can be found in an article titled:

"We Found a Ticking Time B___ in macOS TCP Networking - It Detonates After Exactly 49 Days"

NOTE: The title uses a blocked work, so neither the full title nor the URL can be posted here.

[XRaySpeX]

See We Found a Ticking Time B*** in macOS TCP Networking - It Detonates After Exactly 49 Days