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We have had this problem on and off for the past couple weeks. We are able to get to some sites and not to others. Seems to be mostly on Windows XP systems. Again, some systems seem to have more trouble than others. All of our Windows 7 systems are fine. No problems getting to the internet and viewing all sites. We have a Cisco router from CableVision, WatchGuard 750e XTM appliance and two Asante 48 port Switches. We have rebooted all of these a couple of times and it seems to help. Everybody seems to be working fine and then a day or so goes by and people start to call that they cannot get to some sites. This happens with all browsers. Any ideas would be much appreciated.
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We have had this problem on and off for the past couple weeks. We are able to get to some sites and not to others. Seems to be mostly on Windows XP systems. Again, some systems seem to have more trouble than others. All of our Windows 7 systems are fine. No problems getting to the internet and viewing all sites. We have a Cisco router from CableVision, WatchGuard 750e XTM appliance and two Asante 48 port Switches. We have rebooted all of these a couple of times and it seems to help. Everybody seems to be working fine and then a day or so goes by and people start to call that they cannot get to some sites. This happens with all browsers. Any ideas would be much appreciated.

Issue connecting to the internet

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.