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Manually Configuring IPv4 and IPv6 Policy-based Routes for a Linux ECS with Multiple Network Interfaces (CentOS) Scenarios This section describes how to configure policy-based routes for a CentOS 8.0 64-bit ECS with two network interfaces. IPv4: If IPv4 communication between multiple
What Should I Do If an ECS Cannot Connect to an RDS DB Instance Through a Private Network? Perform the following steps to identify the problem: Check whether the ECS and RDS DB instances are located in the same VPC. If they are in the same VPC, go to 2. If they are in different VPCs
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
EdgeSec.00000019 Frozen Resources Cannot Be Migrated to or from an Enterprise Project (frozen cannot create eps tag) Root Cause Frozen resources cannot be added to or removed from an enterprise project. Troubleshooting Methods Check whether the resource is frozen. Procedure Log in
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
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
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
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.
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
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 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
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
