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What Should I Do If an ECS Cannot Connect to an RDS for PostgreSQL Instance Through a Private Network? Perform the following steps to identify the problem: Check whether the ECS and RDS for PostgreSQL instance are located in the same VPC. If they are in the same VPC, go to 2. If they
What Should I Do If an ECS Cannot Connect to an RDS for MariaDB Instance over a Private Network? Perform the following steps to identify the problem: Check whether the ECS and RDS for MariaDB instance are located in the same VPC. If they are in the same VPC, go to 2. If they are in
What Should I Do If I Can't Connect to My ECS (PostgreSQL) Instance? Error message: Connection refused (Connection refused). Error cause: The port number of the self-built database is incorrect, or the network is disconnected. Solution: Ensure that the port number of the self-built
What Should I Do If I Can't Connect to My ECS (MySQL) Instance? Error message: Access denied for user 'user_name'@'100.xxx.xx.xx' (using password: YES) Error cause: The username or password of the ECS-hosted database is incorrect. Solution: Check whether the username and password
Manually Configuring IPv4 and IPv6 Policy-based Routes for a Linux ECS with Multiple Network Interfaces (Ubuntu) Scenarios This section describes how to configure policy-based routes for an Ubuntu 22.04 server 64-bit ECS with two network interfaces. IPv4: If IPv4 communication between
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
Can I Change the Specifications Defined by a Private Image When I Use the Image to Create an ECS? Yes. You can specify the CPU, memory, bandwidth, system and data disks of the ECS you are creating. The system disk must be smaller than 1,024 GB but no less than the system disk capacity
Is There Any Difference Between the Image Created from a CSBS/CBR Backup and That Created from an ECS? No. You can create a full-ECS image from an ECS, a CSBS backup, or a CBR backup. When you create a full-ECS image from an ECS, the system first creates a backup for the ECS and then
How Do I Change Default DNS Servers of an ECS to Huawei Cloud Private DNS Servers? Huawei Cloud provides private DNS servers for domain name resolution. ECSs use public domain names to access the Internet, but use private domain names to access cloud services like OBS and SMN, with
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
Migrating the System and Data Partitions of a Windows Server to a Huawei Cloud ECS Overview On a Huawei Cloud ECS, the system disk usually has a single partition which is the system partition, and the data disks are separated from the system disk as shown in Figure
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
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
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
