Wait, another angle: if "4k" is related to data, maybe it's about handling large data in the package exceeding limitations. But the SSIS801 error is more about connection issues. Still, it's possible the user is referring to a 4096-byte limit in the package execution when using the 64-bit runtime. If the package exceeds 4096 bytes, it throws an error. So adjusting the SSIS configuration for 32-bit or optimizing the package could help.