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I've encountered below error (vCenter unable to synchronize and all guest VMs become orphaned) yesterday. All VMs are working fine that time. Login to each host and checked but each host are OK and all guest VMs are running well. The error is appear on vCenter only. Checked from vSphere Client and Browser was appeared same error. I try to PING each host IP and Name from vCenter Server. Just got reply from IP and no reply from PING with name. Yes, I realized it is DNS issue. vCenter unable to resolve each host's name. I tried to flush vCenter Server DNS cache by using "ipconfig /flushdns" command via Command Prompt and restart the server once task done. I login to vCenter after it restarted and noticed that vCenter able to sync with all host and all VMs also back to normal. This kind of error can be happen in many situation. but I just share how to resolve because of for other people who encounter same situation like me will not waste their time by r...

When using VMware ESXi 5.5 to deploy VMware View machine with SE spare disk: Host fails with a purple diagnostic screen as below and You see this backtrace in the purple diagnostic screen and in the system logs as below What will you do then? Logs: 2015-01-06T15:09:07.842Z cpu3:32848)@BlueScreen: #PF Exception 14 in world 32848:CmdCompl-3 IP 0x41802f0a5db1 addr 0x6c PTEs:0x88cf47e023;0x88cf47f023;0x8077b72023;0x0; 2015-01-06T15:09:07.842Z cpu3:32848)Code start: 0x41802e400000 VMK uptime: 137:10:13:26.272 2015-01-06T15:09:07.843Z cpu3:32848)0x41240141da00:[0x41802f0a5db1]GFCPutSectionHeader@esx#nover+0x1 stack: 0x41240141da80 2015-01-06T15:09:07.843Z cpu3:32848)0x41240141daa0:[0x41802f0b7332]SEResource_UnlockResources@esx#nover+0x13a stack: 0x41240141dae0 2015-01-06T15:09:07.843Z cpu3:32848)0x41240141dac0:[0x41802f0bb60d]SETxnGTEFaultCleanupCompletionArgs@esx#nover+0x65 stack: 0x0 2015-01-06T15:09:07.844Z cpu3:32848)0x41240141db00:[0x41802f0bb65e]SETxnGTEFaultCo...

As a network engineer/administrator, you would encounter the cabling problem of patch panel to host, patch panel to switch, switch to switch. In these scenarios, you can determine whether switch or physical layer (Layer 1 ) issue or not before contacting to cabling contractor. To do so, you can use below commands. show interface show interface counters show interface counters errors Moreover, you still can find the cabling issue with another testing method. That is Time Domain Reflectometer. To test this in cisco switch, use below commands. test cable tdr interface   port number show cable-diagnostics tdr interface   port number You will know how to use it from below sample pictures. If you are testing FastEthernet, Pair A and Pair B result must be Normal. If you are testing GigabitEthernet , all Pair must be Normal. Other than that result, you need to find out where is the distance that cable becoming fault. The approximate cable fault dista...

As of Audit Purpose or Standard Organization Policy, we need to deploy legal notice logon banner message/warning of usage logon message in domain computers. To do it automatically, we can use logon script/group policy. Since group policy is easy to mange, I'd like to show you how to do it. Open group policy management console, go to group policy objects, right click on it and select new to create new GPO as below. (You can create and link directly on the OU that you wish to deploy GPO but I create it separately to show clearly.) Right click on newly created GPO and select edit to make changes. Go go Computer Configuration>Windows Settings>Security Settings>Security Options> and find Interactive logon: Message tesxt for users ... . Enable and define the message that you wish to show as logon message. Find Interactive logon: Message title for users attempting... and Define the message title for your logon message. After that, link newly crea...

According to business need, you will need to upgrade the OS of your network device in your infrastructure as a Network Administrator/Engineer. I’d like to share the experience of upgrading the IOS in Cisco to the beginners and for those who haven’t done this yet. Before complete the task, you should know and prepare the following. - You must have correct IOS License for your devices - You must have backup of current running configuration and IOS. - You must have Local/Remote TFTP Server/FTP/SFTP Server to keep backup files and new IOS. - You should prepare pre-configured same model device if you have. So you can replace if your task was something wrong. - Upgrading task should do in Maintenance Windows. You shouldn’t do it however you have very good hands-on experience for that. - You should read Tech Notes from Cisco about Bugs for your new IOS before upgrade. Then you can expected what need to be done if something unexpected issue occur. - Be ensure the role ...

Today, I've got below when I try to connect my WSUS Server via WSUS Console. Below logs are display in Event Logs too. The WSUS administration console was unable to connect to the WSUS Server via the remote API.  Verify that the Update Services service, IIS and SQL are running on the server. If the problem persists, try restarting IIS, SQL, and the Update Services Service. The WSUS administration console was unable to connect to the WSUS Server via the remote API. Verify that the Update Services service, IIS and SQL are running on the server. If the problem persists, try restarting IIS, SQL, and the Update Services Service. System.Net.Sockets.SocketException -- No connection could be made because the target machine actively refused it 172.16.99.98:80 Source System Stack Trace:    at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)    at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Soc...

You will receive "Putty Command Line Error" as below if your are using GNS3 and later version. To overcome this error, just go and download Putty.exe that provide from below link. After that , overwrite the Putty.exe in your pre-installed Putty.exe Download Putty for GNS3 Once download and overwrite the Putty.exe, you may try to console Router/Switch/Firewall in GNS3. If you want to know about for that, read details at  http://forum.gns3.net/topic5016.html May you all be happy. (Be knowledgeable, pass it on then)