Abstract: A computing device receives, based on a request to connect to a virtual private network (VPN), a signal that the computing device has been connected to the VPN. The computing device receives handshake data from a server of the VPN. The computing device determines that a threshold time period has passed since a latest-in-time handshake notification of the handshake data, wherein the threshold time period is determined according to a schedule selected based on a connection status between the computing device and the VPN. The computing device provides, based on determining that the threshold time period has passed since the latest-in-time handshake notification of the handshake data, an indicator that the computing device is no longer connected to the VPN.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes, by a VPN entry server, receiving from a client device, via a VPN tunnel between the entry server and the client device, a first request for first content that identifies a first external source for the first content, receiving, from an operative DNS server configured for the tunnel, an Internet Protocol (IP) address of a first VPN system exit server, in response to determining that the first content is unavailable via the first system exit server, identifying a second DNS server, such that a second VPN system exit server for obtaining the first content is available using the second DNS server, obtaining, from the second system exit server, the first content, wherein the second system exit server obtained the first content from the first external source, and transmitting, to the client device, via the tunnel, the first content.

Abstract: Virtual private network (VPN) service provider infrastructure (SPI) receives a request to access a VPN from a client device. The VPN SPI selects an Internet Protocol (IP) address for access to the VPN by the client device from a pool of IP addresses. The VPN SPI provides access to the VPN for the client device via the IP address. The VPN SPI receives one or more handshake notifications from the client device. The VPN SPI determines that a threshold time period has passed since a latest-in-time handshake notification of the one or more handshake notifications. The VPN SPI disconnects the client device from the VPN in response to determining that the threshold time period has passed. The VPN SPI adds the IP address to the pool of IP addresses in response to disconnecting the client device from the VPN.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes, by a VPN entry server, receiving from a client device, via a VPN tunnel between the entry server and the client device, a first request for first content that identifies a first external source for the first content, receiving, from an operative DNS server configured for the tunnel, an Internet Protocol (IP) address of a first VPN system exit server, in response to determining that the first content is unavailable via the first system exit server, identifying a second DNS server, such that a second VPN system exit server for obtaining the first content is available using the second DNS server, obtaining, from the second system exit server, the first content, wherein the second system exit server obtained the first content from the first external source, and transmitting, to the client device, via the tunnel, the first content.

Abstract: Virtual private network (VPN) service provider infrastructure (SPI) receives a request to access a VPN from a client device. The VPN SPI selects an Internet Protocol (IP) address for access to the VPN by the client device from a pool of IP addresses. The VPN SPI provides access to the VPN for the client device via the IP address. The VPN SPI receives one or more handshake notifications from the client device. The VPN SPI determines that a threshold time period has passed since a latest-in-time handshake notification of the one or more handshake notifications. The VPN SPI disconnects the client device from the VPN in response to determining that the threshold time period has passed. The VPN SPI adds the IP address to the pool of IP addresses in response to disconnecting the client device from the VPN.

Abstract: The disclosure generally pertains to clock management systems and methods. An example method involves a computer identifying an inaccuracy in a local clock of a client device based on a data bundle received from the client device. The data bundle can include information associated with an occurrence of an event in the client device. In one embodiment, the inaccuracy in the local clock of the client device is identified by detecting a time difference between a timestamp contained in the data bundle and a reference time standard. The timestamp can correspond to a time of occurrence of the event in the client device or to a time of transmission of the bundle by the client device. A corrective action may be taken to address the inaccuracy in the local clock, such as, by applying a time shift to at least a portion of the information contained in the data bundle.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes, by a VPN entry server, receiving from a client device, via a VPN tunnel between the entry server and the client device, a first request for first content that identifies a first external source for the first content, receiving, from an operative DNS server configured for the tunnel, an Internet Protocol (IP) address of a first VPN system exit server, in response to determining that the first content is unavailable via the first system exit server, identifying a second DNS server, such that a second VPN system exit server for obtaining the first content is available using the second DNS server, obtaining, from the second system exit server, the first content, wherein the second system exit server obtained the first content from the first external source, and transmitting, to the client device, via the tunnel, the first content.

Abstract: Virtual private network (VPN) service provider infrastructure (SPI) receives a request to access a VPN from a client device. The VPN SPI selects an Internet Protocol (IP) address for access to the VPN by the client device from a pool of IP addresses. The VPN SPI provides access to the VPN for the client device via the IP address. The VPN SPI receives one or more handshake notifications from the client device. The VPN SPI determines that a threshold time period has passed since a latest-in-time handshake notification of the one or more handshake notifications. The VPN SPI disconnects the client device from the VPN in response to determining that the threshold time period has passed. The VPN SPI adds the IP address to the pool of IP addresses in response to disconnecting the client device from the VPN.

Abstract: Virtual private network (VPN) service provider infrastructure (SPI) receives a request to access a VPN from a client device. The VPN SPI selects an Internet Protocol (IP) address for access to the VPN by the client device from a pool of IP addresses. The VPN SPI provides access to the VPN for the client device via the IP address. The VPN SPI receives one or more handshake notifications from the client device. The VPN SPI determines that a threshold time period has passed since a latest-in-time handshake notification of the one or more handshake notifications. The VPN SPI disconnects the client device from the VPN in response to determining that the threshold time period has passed. The VPN SPI adds the IP address to the pool of IP addresses in response to disconnecting the client device from the VPN.

Abstract: The disclosure generally pertains to clock management systems and methods. An example method involves a computer identifying an inaccuracy in a local clock of a client device based on a data bundle received from the client device. The data bundle can include information associated with an occurrence of an event in the client device. In one embodiment, the inaccuracy in the local clock of the client device is identified by detecting a time difference between a timestamp contained in the data bundle and a reference time standard. The timestamp can correspond to a time of occurrence of the event in the client device or to a time of transmission of the bundle by the client device. A corrective action may be taken to address the inaccuracy in the local clock, such as, by applying a time shift to at least a portion of the information contained in the data bundle.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes, by a VPN entry server, receiving from a client device, via a VPN tunnel between the entry server and the client device, a first request for first content that identifies a first external source for the first content, receiving, from an operative DNS server configured for the tunnel, an Internet Protocol (IP) address of a first VPN system exit server, in response to determining that the first content is unavailable via the first system exit server, identifying a second DNS server, such that a second VPN system exit server for obtaining the first content is available using the second DNS server, obtaining, from the second system exit server, the first content, wherein the second system exit server obtained the first content from the first external source, and transmitting, to the client device, via the tunnel, the first content.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes, by a VPN entry server, receiving from a client device, via a VPN tunnel between the entry server and the client device, a first request for first content that identifies a first external source for the first content, receiving, from an operative DNS server configured for the tunnel, an Internet Protocol (IP) address of a first VPN system exit server, in response to determining that the first content is unavailable via the first system exit server, identifying a second DNS server, such that a second VPN system exit server for obtaining the first content is available using the second DNS server, obtaining, from the second system exit server, the first content, wherein the second system exit server obtained the first content from the first external source, and transmitting, to the client device, via the tunnel, the first content.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes establishing a VPN tunnel between a client device and a VPN system entry server, which includes configuring a first DNS server as an operative DNS server for the VPN tunnel, and obtaining first content by transmitting to the VPN entry server, a first request that identifies a first external source for the first content, receiving from the VPN entry server a DNS configuration message indicating a second DNS server, configuring the second DNS server as the operative DNS server, and receiving from the VPN entry server, via the VPN tunnel, the first content, wherein the VPN entry server obtained the first content from the first VPN system exit server identified by the VPN entry server using the second DNS server, and the first VPN system exit server obtained the first content from the first external source.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes transmitting, to a VPN entry server, from a client device, via a VPN tunnel between the VPN entry server and the client device, a first request for first content, wherein the first request identifies a first external source for the first content, and wherein a first DNS server is configured as an operative DNS server for the VPN tunnel, and receiving, by the client device, from the VPN entry server, via the VPN tunnel, the first content, wherein the VPN entry server obtained the first content from the first VPN system exit server identified by the VPN entry server using a second DNS server as the operative DNS server for the VPN tunnel, and the first VPN system exit server obtained the first content from the first external source.

Abstract: Virtual private network (VPN) service provider infrastructure (SPI) receives a request to access a VPN from a client device. The VPN SPI selects an Internet Protocol (IP) address for access to the VPN by the client device from a pool of IP addresses. The VPN SPI provides access to the VPN for the client device via the IP address. The VPN SPI receives one or more handshake notifications from the client device. The VPN SPI determines that a threshold time period has passed since a latest-in-time handshake notification of the one or more handshake notifications. The VPN SPI disconnects the client device from the VPN in response to determining that the threshold time period has passed. The VPN SPI adds the IP address to the pool of IP addresses in response to disconnecting the client device from the VPN.

Abstract: Domain name system (DNS) configuration during virtual private network (VPN) connection includes establishing a VPN tunnel between a client device and a VPN system entry server, which includes configuring a first DNS server as an operative DNS server for the VPN tunnel, and obtaining first content by transmitting to the VPN entry server, a first request that identifies a first external source for the first content, receiving from the VPN entry server a DNS configuration message indicating a second DNS server, configuring the second DNS server as the operative DNS server, and receiving from the VPN entry server, via the VPN tunnel, the first content, wherein the VPN entry server obtained the first content from the first VPN system exit server identified by the VPN entry server using the second DNS server, and the first VPN system exit server obtained the first content from the first external source.