Abstract: When a mobile device interacts with a network service, synchronous DNS resolution can significantly impact user experience due to lossy or moderate-high latency conditions. Network services that rely on low-TTL DNS records for failover require a client to frequently resolve the service's host name. It is undesirable to block on these frequent resolutions. In an implementation, user activity on a mobile device is monitored to determine whether the user is engaged in an activity that would contact a server. If such an activity is in progress, then DNS requests to resolve the server's host name are periodically generated to make sure the server's IP address is cached. In an implementation, if a request to communicate with a server fails, the DNS cache expires the entry for that server so that a new DNS request can resolve the server's IP address in case the server's IP address has changed.

Abstract: When a mobile device interacts with a network service, synchronous DNS resolution can significantly impact user experience due to lossy or moderate-high latency conditions. Network services that rely on low-TTL DNS records for failover require a client to frequently resolve the service's host name. It is undesirable to block on these frequent resolutions. In an implementation, user activity on a mobile device is monitored to determine whether the user is engaged in an activity that would contact a server. If such an activity is in progress, then DNS requests to resolve the server's host name are periodically generated to make sure the server's IP address is cached. In an implementation, if a request to communicate with a server fails, the DNS cache expires the entry for that server so that a new DNS request can resolve the server's IP address in case the server's IP address has changed.

Abstract: Mobile devices typically have some form of audio capabilities designed to be operated by the device's user, for example to place phone calls; however, if a device is misplaced or stolen, the user may wish to operate those audio capabilities remotely. Techniques are provided for determining when an audio transmission should be established between a device and one or more clients, and sending a command to initiate the audio transmission. The determination may be based on receiving a request from a client, detecting at a server that the device is lost or stolen, or detecting at the device that the device is missing. The audio transmission may be established without user intervention at the device or in response to user action at the portable electronic device. Device settings such as audio settings at the device may be overridden in connection with the audio transmission.