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Editorial Team
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Asked: 2026-06-01T06:57:19+00:00

I have to open an NSStream to a wifi access point that has only

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I have to open an NSStream to a wifi access point that has only a numerical address, not a name. It takes NSStream 30-40 seconds to open a socket. In experimenting, i found that telnet-ing to the AP from a windows box was instantaneous, but on a mac, connecting the same 30-40 seconds. in researching telnet, i found that the implementation is a little different on a mac, in that it by default tries to to a name lookup. reading the manual page for telnet, i found:
-N Prevents IP address to name lookup when destination host is given as an IP address.

when I used “telnet -N IP-address port”, my connection was instantaneous! I suspect that this same problem is causing the delay in my NSStream connection. Is there any way to do the equivalent of setting the”-N” flag in NSStream?

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1 Answer

  1. Editorial Team

    It looks like NSHost is not available on Cocoa Touch, so you cannot force a host with a given address, though I don’t know if that negates the need for a dns lookup.

    This problem has been around since 2005, though this might not apply to Cocoa Touch libraries. In any case there is no given solution:

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