What is TIC Read Status 1:57 in iOS11/Xcode 9?

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Apple staff gave the following answer:

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

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

In short, a TCP read has failed with ENOTCONN.

As the TCP I/O connection subsystem has no public API, you must necessarily be using it via some high-level wrapper (like NSURLSession).

source: https://forums.developer.apple.com/thread/66058

EDIT/UPDATE:

Since we are all still having these annoying logs, I asked to the same Apple specialist from the above link about our situation, which is now specific for Xcode 9 and Swift 4. Here it is:

A lot of people are complaining about these logs, which I am having as well in all my apps since I upgraded to Xcode 9 / iOS 11.

2017-10-24 15:26:49.120556-0300 MyApp[1092:314222] TIC Read Status [55:0x0]: 1:57  
2017-10-24 15:26:49.120668-0300 MyApp[1092:314222] TIC Read Status [55:0x0]: 1:57  
2017-10-24 15:26:49.626199-0300 MyApp[1092:314617] TIC Read Status [56:0x0]: 1:57

His answer:

It’s important to realise that this ENOTCONN does not necessarily mean that anything has gone wrong. Closed TCP connections are expected in all versions of HTTP. So, unless there’s some other symptom associated with this error, my recommendation is that you ignore it.

source: https://forums.developer.apple.com/message/272678#272678

SOLUTION: Just wait for newer versions/updates of Xcode 9.

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