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Technical Q&As: Cocoa
Networking capabilities in Mac OS X include support for the major protocols and services. Developers can use the networking APIs to provide sophisticated LAN, WAN, Internet, and web capabilities in Cocoa applications. These are accessible through sockets and Core Foundation, as well as through the higher-level Cocoa APIs.

View all Networking Technical Q&As.
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Resolves may return an IPv6 address in Panther (HTML)
QA1298: Explains why you get an IP address of 0.0.0.0 when resolving a Rendezvous service.
2005-01-10
Sending an Email (HTML)
QA1084: Shows how to create an email in the user's prefered email application.
2004-11-05
Rendezvous enforces the TXT record format in Panther (HTML)
QA1306: Explains how mDNSResponder enforces the proper TXT record format in Panther.
2004-07-14
Updating the TXT record of a Rendezvous service (HTML)
QA1302: Explains how to update a Rendezvous TXT record while running on either Jaguar or Panther.
2004-07-14
Getting a Packet Trace (HTML) ()
QA1176: Lists tools available for looking at the network packets on the wire.
2004-07-13
Discovering all advertised Rendezvous service types (HTML)
QA1337: Explains how to discover all Rendezvous service types being advertised on the local network.
2004-06-01
Rendezvous enforces the service type format in Panther (HTML)
QA1198: Explains why registering a Rendezvous service might fail on Panther.
2004-03-23
The Rendezvous Name is not the Rendezvous name (HTML) ()
QA1228: Explains why you should use the Computer Name when advertising a Rendezvous service.
2004-03-05
Downloading through a proxy server in Mac OS X (HTML)
QA1296: Explains when downloading through a proxy server will work, and when it will fail.
2003-10-29
Rendezvous TXT record rate limiting in Panther (HTML)
QA1293: Explains how mDNSResponder implements TXT record rate limiting in Panther.
2003-10-23
Don't forget to cancel your Rendezvous resolve (HTML)
QA1297: Explains why it's important to cancel a Rendezvous resolve operation.
2003-10-15
Rendezvous and wake from sleep (HTML)
QA1290: Explains why applications that use Rendezvous should stay registered and continue browsing on sleep.
2003-09-18
PPPoE Server for Testing (HTML) ()
QA1252: Describes how to configure Mac OS X as a PPPoE server for testing purposes.
2003-04-11
Allocate and Disk Full Error (HTML) ()
FL12: Discusses a problem with AFP volumes displaying incorrect free space, and returning disk full errors.
1999-07-21
Changing the TCP Window Size (HTML)
NW47: Describes how to change the TCP window size in Open Transport.
1997-03-14
T_DATA_REQ vs M_DATA TPI Message Blocks (HTML) ()
NW42: Explains why OT passes data to a TPI module using M_DATA message blocks instead of M_PROTO+T_DATA_REQ.
1996-10-25