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TIC Read Status [6:0x0]: 1:57 Xcode 9 - Network Requests not working

I am trying to make standard Https calls to a web server and am getting TIC Read Status [6:0x0]: 1:57 very frequently and it is preventing webservices from working. Is anyone else having this issue?

Solution

  • TIC Read Error [476:0x60800018dc30]: 1:57

    OK, here’s how this breaks down:

    • “TIC” expands to “TCP I/O connection”, which is a subsystem within CFNetwork that runs a TCP connection
    • “Read Error” is pretty self explanatory
    • “476” is a connection ID number within TIC; it’s not useful to us
    • “0x60800018dc30” is a pointer to the TIC object itself; again it’s not useful to us
    • “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). What API is that? Do you see the error manifest there? If so, what’s does that error look like?

    Hope this breakdown helps.