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How Can I Allow or Deny Login from Specific Users or IP Addresses to an ECS Using SSH? Scenarios This section describes how to allow or deny specific users or IP addresses to access an ECS using SSH. Constraints DenyHosts has been installed on the ECS. The sshd service should be restarted
Why Does My Linux ECS Fail to Access the Internet After Port 80 Is Allowed by the Firewall Rules? Symptom The Linux ECS cannot access the Internet after port 80 is allowed by the firewall rules. After the firewall is disabled, access to the Internet succeeds. Possible Causes The possible
What Can I Do If /etc/resolv.conf Is Restored After an ECS Running Ubuntu Is Restarted? Symptom After an ECS running Ubuntu or network-related services are restarted, the /etc/resolv.conf file is updated, and the nameserver field is restored to 127.0.0.53. Figure 1 Symptom Possible
Why Does the System Display a Message Indicating Invalid Credentials When I Attempt to Access a Windows ECS? Symptom When you use a local PC running Windows to access a Windows ECS using RDP (for example, MSTSC), the system displays a message indicating that the credentials are invalid
Why Do the Modifications to /etc/security/limits.conf Not Take Effect After the ECS Restarts? Symptom Modifications to the /etc/security/limits.conf file become invalid after the ECS restarts. Possible Causes In Linux, file /etc/security/limits.conf and directory /etc/security/limits.d
What Should I Do If I Cannot Use MSTSC to Log In to an ECS Running the Windows Server 2012 OS? Symptom An ECS running the Windows Server 2012 OS has password authentication configured during ECS creation. When a user used the initial password and MSTSC to log in to the ECS, the login
How Do I Obtain My Disk Device Name in the ECS OS Using the Device Identifier Provided on the Console? Scenarios You find that the device name displayed in the ECS OS is different from that displayed on the management console and you cannot determine which disk name is correct. This
Why Does the System Display Invalid Certificate or Associated Chain When I Log In to a Windows ECS from a Mac? Symptom When you use Microsoft Remote Desktop for Mac to remotely access a Windows ECS, the system displays invalid certificate or associated chain. Figure 1 Microsoft Remote
Why Can't I Find My Newly Purchased Data Disk After I Log In to My Windows ECS? Symptom After logging in to my Windows ECS, I cannot find the attached data disk. Formatting a disk will cause data loss. Before formatting a disk, create a backup for it. Possible Causes A newly added
Why Does the System Display Invalid Certificate or Associated Chain When I Log In to a Windows ECS from a Mac? Symptom When you use Microsoft Remote Desktop for Mac to remotely access a Windows ECS, the system displays invalid certificate or associated chain. Figure 1 Microsoft Remote
How Do I Enable My ECS to Boot From the Second Kernel If It Fails to Boot from the First Kernel? Scenarios The operations described in this section apply to ECSs running CentOS or EulerOS with at least two kernels installed. CentOS 6 Log in to the management console, restart the ECS
What Should I Do If Error Code 1006 or 1000 Is Displayed When I Log In to an ECS Through the Management Console? Symptom When I attempted to remotely log in to an ECS using VNC, the system displayed error code 1006, as shown in Figure 1. Figure 1 Error message displayed in a VNC-based
Why Am I Seeing the Error Message "Module is unknown" When I Remotely Log In to a Linux ECS? Symptom When you attempt to remotely log in to a Linux ECS, the system displays the error message "Module is unknown". Figure 1 Module is unknown To resolve this issue, restart the ECS and
Why Does the System Display No Remote Desktop License Servers Available to Provide a License When I Log In to a Windows ECS? Symptom An error message is displayed indicating that there are no Remote Desktop License Servers available to provide a license and asks you to contact the
Why Does My Remote Desktop Session End Because Another User Logs In When I Log In to a Windows ECS? Symptom An error message is displayed indicating that your remote desktop session has ended because another user has connected to the remote computer. Figure 1 Ended remote desktop
Why Am I Seeing the Error Message "Access denied" When I Remotely Log In to a Linux ECS? Symptom When you attempt to remotely log in to a Linux ECS, the system displays the error message "Access denied". Possible Causes Incorrect username or password. A policy that denies logins from
What Should I Do If Executing a Driver Installation Script Failed When I Attempted to Modify the Specifications of a Linux ECS? Symptom During ECS specifications modification, a script was used to automatically install drivers on a Linux ECS. During the installation, the following
What Should I Do If the System Displays a Message Indicating that the Password Is Incorrect When I Remotely Log In to My ECS? Solution Check the network configuration of the ECS and determine whether the fault is caused by a Cloud-Init failure. Verify that port 80 is bypassed in both
How Can I Handle the Issue that a Windows 7 ECS Equipped with an Intel 82599 NIC Reports an Error in SR-IOV Scenarios? Symptom When the 20.4.1 driver package downloaded at Intel website https://downloadcenter.intel.com/search?keyword=Intel++Ethernet+Connections+CD was installed in
Why Do I Get the Error "No space left on device" When I Create a File on a Linux ECS? Symptom When you create a file on a Linux ECS, the error message "No space left on device" is displayed. Possible Causes The block usage on the disk reaches 100%. The inode usage on the disk reaches