A newly discovered issue in macOS is drawing attention for an unusual reason. It does not involve security risks or data leaks, but it can still disrupt a core function of your Mac. If a system is left running continuously for long enough, it may suddenly lose the ability to maintain stable internet connections.
The issue was identified by Photon, which described it as a limitation tied to how macOS handles long uptime. According to the findings, the problem appears after roughly 49.7 days of continuous use. At that point, an internal TCP timestamp counter reaches its maximum value and fails to behave correctly.
This counter is part of how the system manages network connections in the background. When it stops working as expected, active connections do not expire properly. Over time, this leads to networking issues, including the inability to establish or maintain internet connectivity.
For users, the problem can be confusing. The Mac itself continues to function normally. Apps open, files are accessible, and there are no warning messages. However, internet-dependent tasks begin to fail, which can make the issue difficult to diagnose without technical insight.
It is important to note that this is not a vulnerability. There is no evidence that it can be exploited by attackers. Instead, it is a technical limitation caused by integer overflow, where a system counter runs out of values after reaching its maximum limit.
While the issue may sound serious, the workaround is simple. Restarting the Mac resets the counter and restores normal network behavior. In fact, regular reboots are already considered a good practice, as they help clear temporary files, free up memory, and resolve minor system glitches that build up over time.
Apple is likely aware of the issue and may address it in a future macOS update. However, even without an official fix, the impact can be completely avoided with occasional restarts.
These kinds of bugs aren’t new. Older systems like Windows 98 faced similar uptime-related problems. Even widely known events like the Year 2000 problem were rooted in how systems handle time and numerical limits.
Most users may never encounter this issue, since many systems are restarted regularly due to updates or routine use. However, for developers, power users, or anyone running a Mac continuously for weeks, this is something worth knowing.
