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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. Restarting the sshd service
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 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 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
Will My Access Be Restricted by Bandwidth When I Connect to My Instance from an ECS over a Private Network? No. Parent topic: Database Connection
Do I Need to Install IPsec Software on Each Server That Needs to Access an ECS to Establish a VPN Connection? No. VPN connects two LANs. Multiple servers in the on-premises data center use the same public IP address to access the cloud. If you install IPsec software on the on-premises
How Do I Handle the Startup Failure of a Windows ECS Created from a Windows Image Generalized by Sysprep? Symptom When you start the ECS, information similar to the following is displayed. Figure 1 Message displayed Then, the following information is displayed in the dialog box: Windows
What Do I Do If a Partition Is Not Found During the Startup of an ECS Created from an Imported Private Image? Cause Disk partition IDs are changed after the cross-platform image import. As a result, no partition can be found at startup. In this case, you need to change disk partition
Can I Use the System Disk Image of an ECS on a BMS After I Export It from the Cloud Platform? No. The system disk image of an ECS is a VM file that contains a system running environment and does not have an installation boot program. So, it cannot be used on a BMS. For how to create
Will My Access Be Restricted by Bandwidth When I Connect to My Instance from an ECS over a Private Network? No. Parent Topic: Database Connection
What Should I Do If an ECS and RDS Instance Deployed in Different VPCs Cannot Communicate with Each Other? Change the VPC hosting the ECS to the same as that hosting the RDS. Create a VPC peering connection. Parent Topic: Database Connection
What Can I do if I Cannot Obtain Enterprise Projects Using the EPS Java or Python SDK? If you cannot obtain enterprise projects using the EPS Java or Python SDK, you can follow the following procedure to find out the reason: Check whether the token is obtained in DomainToken mode.
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
How Can I Use FTP to Transfer Files from a Local Windows Computer to a Windows or Linux ECS? Scenarios You want to use FTP to transfer files from a local Windows computer to an ECS. Prerequisites An EIP has been bound to the ECS and access to TCP port 21 is allowed in the inbound
What Should I Do If an ECS Cannot Connect to an RDS for SQL Server Instance Through a Private Network? Perform the following steps to identify the problem: Check whether the ECS and RDS for SQL Server instance are located in the same VPC. If they are in the same VPC, go to 2. If they
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 My ECS Fails to Access a Server on the Public Network Through a Public NAT Gateway? TCP connection may fail when an ECS accesses a server on the public network through an SNAT rule. Perform the following steps to locate the fault cause: Run the following command
How Do I Configure an ECS, a BMS, or an Image File Before I Use It to Create an Image? ECS or Image File Configurations Table 1 ECS configurations OS Configuration Windows Configuring DHCP Enabling Remote Desktop Connection Installing the One-Click Password Reset Plug-In (Optional
What Should I Do If I Can't Connect to My ECS (Microsoft SQL Server) Instance? Error message: The TCP/IP connection to the host 100.xxx.xx.xx, port xxx has failed. Error cause: The port number of the self-built database is incorrect, or the network is disconnected. Solution: Ensure
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
