TIC READ ERROR in Mac OSX Sierra

Question

When I run my app on OSX 10.12, I see this error in the log, even though my app still functions normally:

error   11:31:23.274910 -0700   MyApp   TIC Read Error [76:0x6000001945d0]: 1:57
error   11:32:24.774500 -0700   MyApp   TIC Read Error [77:0x608000193590]: 1:57
error   11:33:24.903966 -0700   MyApp   TIC Read Error [79:0x61800018cd90]: 1:57
error   11:33:42.201840 -0700   MyApp   TIC Read Error [63:0x6000001911d0]: 1:57
error   11:33:42.201908 -0700   MyApp   TIC Read Error [70:0x6100001938d0]: 1:57
error   11:33:42.217283 -0700   MyApp   TIC Read Error [60:0x61800018df70]: 1:57
error   11:33:42.217388 -0700   MyApp   TIC Read Error [53:0x600000190cf0]: 1:57
error   11:33:42.338048 -0700   MyApp   TIC Read Error [66:0x618000192140]: 1:57
error   11:34:25.216051 -0700   MyApp   TIC Read Error [81:0x60800018c160]: 1:57

Googling shows a few people report this with other apps, but there's no explanation of what that error means. What does "TIC" mean in Sierra? "Trusted Internet Connection"? "Text Input Console"? "Tyrannosaurus Incoming Comet"?

Answer 1

“TIC” expands to “TCP I/O connection”, which is a subsystem within CFNetwork that runs a TCP connection

Answer 2

TIC stands for - TCP I/O Connection

“1” and “57” are the CFStreamError domain and code, respectively; a domain of 1 is kCFStreamErrorDomainPOSIX and, within that domain, 57 is ENOTCONN

Beyond that, it’s important to realise that this ENOTCONN does not necessarily mean that anything has gone wrong.

Sources:

• https://forums.developer.apple.com/message/272678
• https://forums.developer.apple.com/thread/66058