You can fix the issues found in checks by following the steps below.
Windows OS status
Issue description
The system may have issues like degraded stability, pre-failure, inability to start, and start-up/shut-down related problems, and involve such risks as unexpected restart and crash.
Solution
1. Back up data by creating snapshots or other means to ensure data security. For more information, see Creating Snapshots.
2. Restart the instance through the console. For more information, see Restarting Instances.
3. Run TAT again to check whether the issue is fixed. If the issue persists, try the following solutions:
Reinstall the instance system through the console. For more information, see Reinstalling System.
Restore the instance quickly by rolling back snapshots. For more information, see Rolling Back Snapshots. For snapshot-related issues, see Snapshot FAQs.
Memory limit
Issue description
Memory underutilization occurs on the Windows operating system. Memory bottlenecks may exist, preventing the system from maximizing its performance.
2. Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
3. Enter taskmgr.exe in the powershell window, and press Enter to open the "Task Manager" window.
4. In the "Task Manager" window, select Details and click the Performance tab. You can check the total number of handles.
5. Select the Details tab, right-click the first row of the details, and then click Select Column in the pop-up menu.
6. In the "Select Column" pop-up window, select "Handle", and then click OK.
7. Click Handle in the first row to sort processes by the number of handles in descending order.
8. Right-click the process with the most handles, and select Create Dump File from the pop-up menu.
9. Click OK in the "Dump Process" pop-up window.
10. Update system patches, install antivirus software, and perform virus scans as needed.
System brute force and attacks
Issue description
Brute force and attacks can cause system stutters or even a system crash. This can affect the normal operation of services or even lead to data loss.
Solution
Set the security group policy reasonably through the console by only allowing necessary IPs and ports and denying others by default. For more information, see Security Group Overview.
System environment variables
Issue description
Issues related to environment variables can cause the failure of some commands (you are prompted that the command does not exist, or an exception occurs after the command is executed, such as a window that keeps popping up.)
2. Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
3. Enter sysdm.cpl in the powershell window, and press Enter to open the "System Properties" window.
4. In the "System Properties" window, select the Advanced tab, and click Environment Variables.
5. Double-click Path in "System Variables" to check the environment variables.
Make sure the following 4 environment variables exist, are in the correct order, and are placed at the top. If you have other custom environment variables, put them at the bottom.
If any issue occurs with your environment variables, fix it:
%SystemRoot%\\system32
%SystemRoot%
%SystemRoot%\\System32\\Wbem
%SYSTEMROOT%\\System32\\WindowsPowerShell\\v1.0\\
High memory usage
Issue description
High memory usage can degrade system performance, and insufficient available memory can cause system stutters.
2. Identify the process with the highest memory usage by viewing the check results or "Task Manager". The following are the steps for identifying the process in "Task Manager".
2.1 Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
2.2 Enter resmon in the powershell window, and press Enter to open "Resource Monitor".
2.3 In "Resource Monitor", verify whether the process with the highest memory usage is running normally.
If the business is checked out：
If the identified process is necessary for your business, upgrade your instance configuration by referring to Changing Instance Configuration.
If the process is not for your business, it is recommended to update system patches, install antivirus software, or perform virus scans as needed.
High virtual memory usage
Issue description
Long-term insufficient virtual memory can lead to problems such as Windows activation registry corruption, restricted memory, or restricted login.
2. Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
3. Enter sysdm.cpl in the powershell window, and press Enter to open the "System Properties" window.
4. In the "System Properties" pop-up window, click Settings under "Performance".
5. In the "Performance Options" pop-up window, select the Advanced tab, and click Change.
6. In the "Virtual Memory" pop-up window, set the following options.
7. Deselect "Automatically manage paging file size for all drives".
8. Select a drive with sufficient disk space to host the paging file on this drive. Drive C is selected in this example.
9. Select "Custom Size" and set the paging file size.
10. Click Settings.
11. Click OK.
Note:
Since virtual memory depends on physical memory and free drive space, it is recommended to change the instance resource configuration to increase physical memory. For more information, see Changing Instance Configuration.
High total CPU usage
Issue description
Excessive CPU usage can cause degraded system performance, and insufficient available CPU resources may lead to instance stutters or even your failure to log in to the instance.
2. Identify the process with the highest CPU usage by viewing the check results, "Task Manager", or "Resource Monitor". The following are the steps for identifying the process in "Resource Monitor".
2.1 Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
2.2 Enter resmon in the powershell window, and press Enter to open "Resource Monitor".
2.3 In "Resource Monitor", select the CPU tab to verify whether the process with the highest CPU usage is running normally.
If the business is checked out：
If the identified process is necessary for your business, upgrade your instance configuration by referring to Changing Instance Configuration.
If the process is not for your business, it is recommended to update system patches, install antivirus software, or perform virus scans as needed.
High usage of a single CPU
Issue description
If the usage of a single logical CPU is too high, but that of other logical CPUs is low, this can lead to an uneven distribution of CPU resources and the inability to maximize the system performance.
Solution
1. Identify the process with the highest CPU usage of a single CPU from the check results.
2. Verify whether the process is running normally.
If yes, ignore it.
If not, it is recommended to optimize the CPU usage of the abnormal process (unless the high CPU usage is for a specific purpose), or contact the program manufacturer for optimization and adaptation.
Large space occupied by metafiles in NTFS file system
Issue description
The large total size of metafiles hidden in the NTFS file system can lead to insufficient system space.
Solution
This issue is caused by an excessive number of metafiles. If the issue occurs occasionally, it is recommended to back up your data and then format the drive. If the issue occurs frequently, please check whether the program generates an excessive number of files, and then optimize the program.
Remote Desktop Services (RDS) status
Issue description
RDS has an abnormal status, which results in the failure to log in to the CVM remotely (you can only log in through VNC).
2.1 Right-click in the lower left corner of the operating system's desktop,
, and select Settings.
2.2 Select Update & Security in the "Settings" window, and click Activate on the left.
2.3 Check whether the system is activated. If not, activate it by following the steps described in System Activation.
3. Reset WinSock
3.1 Execute the following command to reset WinSock.
netsh.exe winsock reset
3.2 After executing the command, restart the instance make the settings take effect. For more information, see Restarting Instances.
4. Fixing multi-user login remote
If you have installed Remote Desktop Services for multi-user login, it is recommended to uninstall it, and then install it again after troubleshooting.
By following the steps below, export and back up the registry file of the abnormal instance, and then import the registry file of a normal instance to the abnormal instance.
4.1 Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
4.2 Enter regedit in the powershell window, and press Enter to open "Registry Editor".
4.3 In the file tree on the left of the "Registry Editor", locate the WinStations file under the path HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\WinStations.
4.4 Right-click the WinStations file, and select Export from the pop-up menu. As shown in the figure below:
4.5 Set a name for the exported file in the pop-up window, such as WinStations.reg in this example.
4.6 Click OK, and then view the exported file WinStations.reg in the specified location.
4.7 After backup, export the registry file WinStations of the normal instance, and then import it to the abnormal instance. Double-click the WinStations.reg file to be imported, and click Yes in the pop-up window to import it.
RDP-TCP connection
Issue description
The RDS port is not listened. You are unable to log in to the CVM remotely, and can only log in through VNC.
Your failure to import the License within the 120-day period results in the failure of remote login (you can only log in through VNC).
Solution
The Microsoft system allows up to 2 accounts to log in concurrently by default. If multi-user remote login is not required, you're recommended to uninstall the RDS roles to quickly fix the issue. If multi-user remote login is required, contact Microsoft to purchase RDS CALs (Client Access Licenses). For more information, see Setting Up Windows CVM for Multi-User Remote Login.
The RDS port is blocked in the Windows CVM's firewall settings. As a result, you are unable to log in to the CVM remotely, and can only log in through VNC.
2. Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
3. Enter wf in the powershell window, and press Enter to open the "Windows Firewall with Advanced Security" window.
4. In the "Windows Firewall with Advanced Security" window, click Windows Firewall Properties in "Overview". As shown in the figure below:
5. In Local Computer > "Properties", switch to "Domain Profile", "Private Profile", and "Public Profile" respectively, and set "Firewall State" to "Off".
6. Click OK to save the settings.
After turning off the instance's firewall, allow the RDS port of the instance by configuring the security group in the console. For more information, see Adding Security Group Rules.
Port exhaustion
Issue description
The port exhaustion causes the network disconnection problem.
Number of connections in Timewait/Closewait status
Issue description
A large number of connections in Timewait/Closewait status may lead to your inability to log in remotely, or even port exhaustion and network disconnection.
It is recommended to use a security group to only allow necessary IPs and port numbers for filtering out malicious requests. At the same time, replace the default service ports with too many connections in wait status as needed, for example, the default port 3389 for Remote Desktop Services.
2. Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
3. Enter ncpa.cpl in the powershell window, and press Enter to open the "Network Connection" window.
4. In the "Network Connection" window, restart the NIC:
Right-click the NIC, and select Disable from the pop-up menu.
Right-click again, select Enable to try a quick fix.
5. If the problem persists, verify whether the NIC obtains an IP address automatically. If not, it is recommended to set it to "Obtain an IP address automatically". The steps are as follows:
5.1 Right-click the NIC in the "Network Connection" window, and select Properties from the pop-up menu.
2.Select "Internet Protocol Version 4 (TCP/IPv4)" in the "Ethernet X Properties" pop-up window, and then click Properties.
5.2 In the "Internet Protocol Version 4 (TCP/IPv4)" pop-up window, select "Obtain an IP address automatically".
5.3 Click OK, and then check the gateway status again.
MAC address
Issue description
An abnormal MAC address may cause network disconnection.
2. Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
3. Enter ncpa.cpl in the powershell window, and press Enter to open the "Network Connection" window.
4 Right-click the NIC in the "Network Connection" window, and select Properties from the pop-up menu.
4. In the Ethernet X Properties pop-up window, click Configuration.
5. In the "Tencent VirtIO Ethernet Adapter Properties" pop-up window, select the Advanced tab, select Assign MAC in "Properties", and set it to "Absent".
6. Click OK to save the settings.
7. In the "Network Connection" window, restart the NIC:
Right-click the NIC, and select Disable from the pop-up menu.
Right-click again, and select Enable.
Intranet domain name resolution
Issue description
The nslookup and ping commands fail to query DNS data for an intranet, resulting the inability to activate the system and sync time.
2. Right-click in the lower left corner of the operating system's desktop,
, and select Windows PowerShell (Admin) from the pop-up menu.
3. Enter ncpa.cpl in the powershell window, and press Enter to open the "Network Connection" window.
4 Right-click the NIC in the "Network Connection" window, and select Properties from the pop-up menu.
5.Select "Internet Protocol Version 4 (TCP/IPv4)" in the "Ethernet X Properties" pop-up window, and then click Properties.
4. In the "Internet Protocol Version 4 (TCP/IPv4)" pop-up window:
It is recommended to select "Obtain DNS server address automatically", or add CVM default DNS addresses (generally, add 183.60.83.19 and 183.60.82.98 for a private network).
If the instance is a domain environment, click Advanced. Then in the "Advanced TCP/IP Settings" window, it is recommended to place the CVM default DNS addresses after the domain DNS.
5. Execute the following command in the powershell window to check the persistent route.
route print
If the route information in the returned result does not start with 169.254.0.0, execute the following command to add it.
Yes
No
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