Event ID 15 — HTTP Service Response Cache Availability

Updated: January 7, 2009

Applies To: Windows Server 2008 R2

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Response Cache Availability relates to the ability of the HTTP Service to fulfill requests from its response cache.

Event Details

Product: Windows Operating System
ID: 15
Source: Microsoft-Windows-HttpEvent
Version: 6.1
Symbolic Name: HTTP_EVENT_SEND_ERROR
Message: Error %3 occurred while sending (corresponding to request ID %1). A TCP Resent will be sent.

Resolve

Restore network connectivity

First, use basic network and hardware troubleshooting steps to check that client hardware (cables and network adapters) are working properly.

If the client hardware appears to be working properly, check that the DHCP server is available on the network by using ping from another computer on the same network as the affected DHCP client.

If the DHCP server does not return the PING message, there might be a network outage, or the DHCP server might be offline or otherwise malfunctioning. If the DHCP server returns the PING message, return to the DHCP client computer and test its IP configuration.

To test a TCP/IP configuration by using the ping command

  1. Click Start, type cmd in Start Search, and then press ENTER.
  2. At the command prompt, type ipconfig.
  3. From the display of the ipconfig command, ensure that the network adapter for the TCP/IP configuration you are testing is not in a media disconnected state. For more information, see Notes.
  4. At the command prompt, send a PING message to the loopback address by typing ping 127.0.0.1.
  5. Send a PING message to the IP address of the computer.
  6. Send a PING message to the IP address of the default gateway.
  7. If the ping command fails, verify that the IP address of the default gateway is correct and that the gateway (router) is operational.
  8. Send a PING message to the IP address of a remote host (a host that is on a different subnet).
  9. If the ping command fails, confirm that the IP address of the remote host is correct, that the remote host is operational, and that all of the gateways (routers) between this computer and the remote host are operational.
  10. Send a PING message to the IP address of the DNS server.
  11. If the ping command fails, confirm that the IP address of the DNS server is correct, that the DNS server is operational, and that all of the gateways (routers) between this computer and the DNS server are operational.

Notes

  • If the ipconfig command displays a media disconnected state, the network cable is not plugged into the network adapter.
  • If the ping command is not found or the command fails, you can use Event Viewer to check the system log and look for problems reported by Setup or the Internet Protocol (TCP/IP) service.
  • The ping command uses Internet Control Message Protocol (ICMP) Echo Request and Echo Reply messages. Packet filtering policies on routers, firewalls, or other types of security gateways might prevent the forwarding of this traffic.

Verify

Response cache entries should contain all URLs that have been successfully added to the cache.

To view the entries and their properties within the response cache:

  1. Click Start; click All Programs; click Accessories; right-click Command Prompt; click Run as administrator; and then click Continue.
  2. Type netsh http show cachestate to verify that the expected URL entries are in the cache.

show cachestate

Lists all resources and their associated properties that are cached in the HTTP response cache or displays a single resource and its associated properties.

Syntax

show cachestate [[url=]string]

Parameters

Term

Description

show cachestate [[url=]string]

Fully qualified URL. If unspecified, implies all URLs. The URL can also be a prefix to registered URLs.

Examples

show cachestate url=http://www.contoso.com:80/myresource

show cachestate

Related Management Information

HTTP Service Response Cache Availability

Networking

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