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- Announcements
- Updating Some Image Pip Package Management Tools for CentOS 7
- CentOS 8 End of Maintenance
- Discontinuation of Support for SUSE Commercial Images
- Price Reduction in Selected Availability Zones
- OrcaTerm Proxy IP Addresses Updates
- Pay-as-you-go Price Adjustments for Standard S3 CVMs in the Silicon Valley Region
- Vulnerability repairing for Linux images
- Stopping supporting for Ubuntu 10.04 images
- Solution to Tomcat Start Failure on Ubuntu14.04
- Upgrading Virtio network card drive for Windows CVMs
- About Configuration of Security Group Port 53
- Windows Server 2003 System Images End of Support Announcement
- End of Support for Windows Server 2008 R2 Enterprise Edition SP1 64-bit System Images
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Operation Guide Overview
- Use Limits
- Convenience Features
- Instances
- Creating Instances
- Managing Instance Launch Template
- Batch Sequential Naming or Pattern String-Based Naming
- Logging In to Linux Instances
- Logging in to Windows instance
- Adjusting Configuration
- View Instance Details
- Renaming Instances
- Resetting Instance Password
- Managing Instance IPs
- Changing Instance Subnet
- Changing Security Group
- Conversion from Pay-As-You-Go to Monthly Subscription
- Searching for Instances
- Exporting Instance List
- Renewing Instances
- Starting Up Instances
- Shutting Down Instances
- Restarting Instances
- Reinstalling System
- Using Tencent Cloud Automation Tools to execute commands
- Terminating/Returning Instances
- Enabling Instance Termination Protection
- Instance Repossession or Recovering
- Spot Instances
- Querying the Repossession Status of a Spot Instance
- No Charges When Shut Down for Pay-as-You-Go Instances
- Managing Roles
- Enabling and Disabling Hyper-Threading
- Reserved Instances
- Images
- Migrating Servers
- Maintenance Tasks
- Cloud Disks
- Networking
- Security
- Security Groups
- Protection of Sensitive Operations
- Managing Login Password
- Managing SSH Keys
- Spread Placement Group
- Unblocking Port 25
- Tags
- Monitoring and Alarms
- Sample Console Configuration
- Best Practice
- Best Practices
- Choosing the CVM Model
- Setting up a Website
- Building an Environment
- Building a Website
- Building an Application
- Building a Visual GUI
- Data Backup
- Uploading Local Files to CVM
- Copying Local Files to CVMs
- Uploading Files from Windows to a Windows CVM via MSTSC
- Uploading Files from MacOS to Windows CVM Using MRD
- Uploading Files from Linux to Windows CVM using RDP
- Uploading files via WinSCP to a Linux CVM from Windows
- Uploading Files from Linux or MacOS to Linux CVM via SCP
- Uploading Files from Linux to a CVM Using FTP
- Uploading Files from Windows to a CVM Using FTP
- Other CVM Operations
- CVM Access to COS via a Private Network
- Best Practices for Boot Mode Legacy BIOS and UEFI
- Recovering Data on Linux CVMs
- Managing Disk Space on Windows CVMs
- Changing Kernel of a Linux Instance Manually
- Setting Up Windows-based AD Domain on a CVM
- Network Performance Test
- High-throughput Network Performance Test
- Using USB/IP to Share USB Devices in Linux
- Using RemoteFx to Redirect USB Devices in Windows
- Using AVX-512 Instructions to Accelerate AI Applications on CVM
- Building Tencent SGX Confidential Computing Environment
- Configuring Persistent Memory in M6p Instances
- Calling Cloud APIs via Python to Share Custom Images in Batches
- Operations Guide
- Initializing Data Disks
- Environment Configurations
- Installing Software
- User Data
- Work with Operating Systems
- System Activation
- System Updates
- System Shutdown
- Configuring High-performance Power Management
- Windows Recovery Mode
- Updating the Virtio ENI Driver
- Modifying SID
- Modifying VNC Resolution
- Ensuring Unique SIDs for CVMs Using Sysprep
- Use of the atop Monitoring Tools by Linux Instances
- Introduction to Linux Kernel Parameters
- Others
- Troubleshooting
- Instance-Related Failures
- CVM Login Failures
- Windows Instance Login Failures
- Windows Instance Login Failures
- An authentication error occurred when you tried to log in to a Windows instance remotely
- Failed to Reset the CVM Password or the CVM Password Is Invalid
- Connection to a Windows CVM through Remote Desktop was denied
- Requires network-level identity verification
- Problems occurred when you tried to log in to a Windows CVM remotely on Mac
- Failed to log in to a Windows CVM due to high CPU and memory usage
- Failed to connect to a remote computer through Remote Desktop
- Credentials Not Work
- Windows instance: no remote Desktop license server can provide license
- Remote Login Failure Due To Port Issues
- Linux Instance Login Failures
- Linux Instance Login Failures
- Unable to Log in to a Linux Instance via SSH Key
- Failing to log in to a Linux CVM due to high CPU and memory usage
- Remote Login Failure due to Port Issues
- VNC Login Error (Module is Unknown)
- VNC Login Error (Account Locked due to XXX Failed Logins)
- VNC Login Error (Login Failed with Correct Password)
- VNC or SSH Login Error (Permission Denied)
- Login Failure Due to /etc/fstab Configuration Errors
- sshd Configuration File Permissions
- Infinite Loop Call in /etc/profile
- Login Failure Due to Server Isolation
- Login Failure Due to High Bandwidth Occupation
- Remote Connect Failure Due to Security Group Settings
- Troubleshooting Linux Instance Issues via VNC and Rescue Mode
- Failed to shut down or restart a CVM
- Network Namespace Creation Failure
- Kernel and IO Issues
- Missing System bin or lib Soft Link
- Suspected Infection with Virus
- "no space left on device" Error During File Creation
- Linux CVM Memory Issues
- Network Related Failures
- Instance-Related Failures
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Region APIs
- Instance APIs
- DescribeInstances
- DescribeInstanceFamilyConfigs
- DescribeZoneInstanceConfigInfos
- DescribeInstanceTypeConfigs
- DescribeInstancesOperationLimit
- DescribeInstanceVncUrl
- InquiryPriceRunInstances
- InquiryPriceResetInstance
- InquiryPriceResetInstancesType
- InquiryPriceResizeInstanceDisks
- RunInstances
- StartInstances
- RebootInstances
- StopInstances
- ResetInstance
- TerminateInstances
- ResetInstancesType
- ResizeInstanceDisks
- ResetInstancesPassword
- ModifyInstancesAttribute
- ModifyInstancesProject
- InquirePricePurchaseReservedInstancesOffering
- DescribeReservedInstancesConfigInfos
- DescribeInstancesStatus
- PurchaseReservedInstancesOffering
- Cloud Hosting Cluster APIs
- Placement Group APIs
- Image APIs
- Key APIs
- Security Group APIs
- Network APIs
- Instance Launch Template APIs
- Data Types
- Error Codes
- FAQs
- Related Agreement
- Glossary
Login Failure Due to High Bandwidth Occupation
Last updated: 2024-01-06 17:32:18
This document describes how to diagnose and troubleshoot Linux or Windows CVM login issues caused by high bandwidth utilization.
Problems
In the CVM console, the bandwidth monitoring data of the CVM shows that bandwidth usage is too high, and connection to CVM fails.
A Health check shows that the bandwidth utilization is too high.
Fault Locating and Troubleshooting
1. Log in to the target CVM instance using VNC:
For Windows instances, see Logging into Windows Instance via VNC.
For Linux instances, see Logging In to Linux Instances (VNC).
2. Troubleshoot:
After logging in to the Windows CVM instance via VNC, perform the following operations:
Note:
The following operations use a CVM instance running the Windows Server 2012 operating system as an example.
1. In the CVM instance, click 
2. Select Performance tab, and click Open resource monitor.
3. On the Resource Monitor page, identify the process that consumes a lot of bandwidth. Based on your actual business, determine whether the process is normal.
If this process is a service process, check whether the high bandwidth utilization is caused by changes in access traffic and whether you need to optimize the capacity or upgrade the CVM configuration as instructed in Changing Instance Configuration.
If this process has an exception, the high bandwidth utilization may be caused by a virus or a trojan. If so, you can manually terminate the process or use security software to kill the virus. You can also back up data and then reinstall the operating system.
Note:
In Windows, many virus processes can disguise themselves as system processes. You can select Task Manager > Processes to check the process information and preliminarily identify the virus.
Normal system processes have complete signatures and descriptions, and most of them are located in the
C:\\Windows\\System32 directory. While virus programs may have the same names as system processes, they lack signatures and descriptions. In addition, their locations are often abnormal.If this process is a Tencent Cloud component process, please submit a ticket, and we will help you locate and troubleshoot the problem.
After logging in to the Linux CVM instance via VNC, perform the following operations:
Note:
The following operations use a CVM instance running the CentOS 7.6 operating system as an example.
1. Run the following command to install the iftop tool. This tool monitors traffic for Linux CVM instances.
yum install iftop -y
Note:
For Ubuntu system, run the
apt-get install iftop -y command.2. Run the following command to install lsof.
yum install lsof -y
3. Run the following command to run iftop.
iftop
"<=" and "=>" indicate the direction of the traffic.
"TX" indicates the traffic is outbound.
"RX" indicates the traffic is inbound.
"TOTAL" indicates the total traffic.
"Cum" indicates the total traffic from the moment iftop started to run until now.
"peak" indicates the traffic peak.
"rates" indicates the average traffic over the last 2, 10, and 40 seconds.
4. Based on the IP address of the consumed traffic in iftop, run the following command to check the process connected to this IP address.
lsof -i | grep IP
For example, if the IP address of the consumed traffic is 201.205.141.123, run the following command:
lsof -i | grep 201.205.141.123
If the following result is returned, the majority of the CVM bandwidth is consumed by the SSH process.
sshd 12145 root 3u IPV4 3294018 0t0 TCP 10.144.90.86:ssh->203.205.141.123:58614(ESTABLISHED)sshd 12179 ubuntu 3u IPV4 3294018 0t0 TCP 10.144.90.86:ssh->203.205.141.123:58614(ESTABLISHED)
5. View the process that consumes a lot of bandwidth and check whether the process is normal.
If this process is a service process, check whether the high bandwidth utilization is caused by changes in access traffic and whether you need to optimize the capacity or upgrade the CVM configuration as instructed in Changing Instance Configuration.
If this process has an exception, the high bandwidth utilization may be caused by a virus or a trojan. If so, you can manually terminate the process or use security software to kill the virus. You can also back up data and then reinstall the operating system.
If this process is a Tencent Cloud component process, please submit a ticket, and we will help you locate and troubleshoot the problem.
We strongly recommend that you query the location of the destination IP on the IP138 query website. Note that the security risk is greater if the destination IP is found to be located in a region outside the Chinese mainland.
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