Hi everyone,My Vista machine won't stop ARP-ing this one unresponsive IP. Is there any service that causes repeated, nagging ARP requests like this?Here are my running processes/respective svcs. below:Image Name PID Services========================= ======== ============================================System Idle Process 0 N/ASystem 4 N/Asmss.exe 396 N/Acsrss.exe 464 N/Awininit.exe 508 N/Acsrss.exe 528 N/Aservices.exe 560 N/Alsass.exe 576 KeyIso, SamSslsm.exe 584 N/Awinlogon.exe 744 N/Asvchost.exe 768 DcomLaunch, PlugPlaysvchost.exe 828 RpcSssvchost.exe 864 WinDefendsvchost.exe 964 Audiosrv, Dhcp, Eventlog, lmhosts, wscsvcsvchost.exe 992 AudioEndpointBuilder, Netman, PcaSvc, SysMain, TrkWks, UxSms, Wlansvc, wudfsvcsvchost.exe 1048 AeLookupSvc, BITS, Browser, EapHost, gpsvc, IKEEXT, LanmanServer, MMCSS, ProfSvc, RasMan, Schedule, seclogon, SENS, SessionEnv, ShellHWDetection, Themes, Winmgmt, wuauservaudiodg.exe 1144 N/ASLsvc.exe 1180 slsvcsvchost.exe 1216 EventSystem, fdPHost, FDResPub, LanmanWorkstation, netprofm, nsi, SSDPSRV, upnphost, W32Timesvchost.exe 1304 CryptSvc, Dnscache, KtmRm, NlaSvc, TapiSrv, TermService, Wecsvcspoolsv.exe 1508 Spoolersvchost.exe 1532 BFE, MpsSvcsvchost.exe 1924 PolicyAgentTCPSVCS.EXE 1948 simptcpsvchost.exe 2004 stisvcsvchost.exe 252 WerSvcSearchIndexer.exe 300 WSearchXAudio.exe 420 XAudioServicehpqWmiEx.exe 472 hpqwmiextaskeng.exe 2068 N/Adwm.exe 2244 N/Aexplorer.exe 2280 N/Arundll32.exe 2376 N/ASynTPStart.exe 2384 N/AQPService.exe 2392 N/AQLBCTRL.exe 2400 N/AMSASCui.exe 2412 N/AWiFiMsg.exe 2420 N/Acledx.exe 2436 N/Audtray.exe 2444 N/Awmpnscfg.exe 2452 N/ASynTPEnh.exe 2492 N/Awmpnetwk.exe 2508 WMPNetworkSvcsoffice.exe 2632 N/Arundll32.exe 2652 N/AWmiPrvSE.exe 2668 N/Asoffice.bin 2760 N/Aunsecapp.exe 2824 N/Ataskeng.exe 3712 N/AAluSchedulerSvc.exe 1012 Automatic LiveUpdate SchedulerHPHC_Service.exe 2588 HP Health Check Servicefirefox.exe 3040 N/Athunderbird.exe 2076 N/Aconime.exe 2564 N/Acmd.exe 4688 N/Awireshark.exe 5264 N/Adumpcap.exe 4492 N/Ataskmgr.exe 4732 N/Atasklist.exe 5104 N/AWmiPrvSE.exe 4480 N/AMuchas gracias folks!

Hi, The unexpected APR requests may be generated by certain third party application, please boot into Safe Mode with Networking and check the result. If the issue resolved, refer to the following KB article to determine the culprits: How to troubleshoot a problem by performing a clean boot in Windows Vista http://support.microsoft.com/kb/929135/en-us Hope it helps.

I am having the same problem, and it makes internet experience world wide wait. Very annoying. And no easy solutions. Thanks Microsoft!

For me the problem was being caused by the Print Spooler. As soon as I disabled the service it stopped the arp requests. Unfortunately havent figured out how to fix it so I can leave the printer driver on.