# Troubleshooting
This section contains information about how to monitor the system and how to troubleshoot specific issues.
**Topics**
+ [General Debugging and Monitoring](res-troubleshooting-general.md)
+ [Issue RunBooks](res-troubleshooting-issue-runbooks.md)
+ [Known Issues](res-troubleshooting-known-issues.md)
Detailed contents:
+ [General Debugging and Monitoring](res-troubleshooting-general.md)
+ [Useful log and event information sources](res-troubleshooting-general.md#res-troubleshooting-general-info)
+ [Where to find environment variables](res-troubleshooting-general.md#res-troubleshooting-general-info-env-vars)
+ [Log files on the environment Amazon EC2 instances](res-troubleshooting-general.md#res-troubleshooting-general-info-logs)
+ [CloudFormation Stacks](res-troubleshooting-general.md#res-troubleshooting-cf-stacks)
+ [System failures due to an issue and reflected by Amazon EC2 Auto Scaling Group Activity](res-troubleshooting-general.md#res-troubleshooting-asg-activity)
+ [Typical Amazon EC2 Console Appearance](res-troubleshooting-general.md#res-troubleshooting-ec2-console)
+ [Infrastructure hosts](res-troubleshooting-general.md#res-troubleshooting-ec2-console-infra)
+ [Infrastructure hosts and virtual desktops](res-troubleshooting-general.md#res-troubleshooting-ec2-console-virtual)
+ [Hosts in a terminated state](res-troubleshooting-general.md#res-troubleshooting-ec2-console-hosts-terminated)
+ [Useful Active Directory (AD) related commands for reference](res-troubleshooting-general.md#res-troubleshooting-ec2-console-active-dir)
+ [Windows DCV debugging](res-troubleshooting-general.md#res-troubleshooting-windows-dcv)
+ [Find Amazon DCV Version Information](res-troubleshooting-general.md#res-troubleshooting-find-nice-dcv)
+ [Issue RunBooks](res-troubleshooting-issue-runbooks.md)
+ [Installation issues](res-troubleshooting-issue-runbooks.md#installation-issues)
+ [CloudFormation stack fails to create with message "WaitCondition received failed message. Error:States.TaskFailed"](res-troubleshooting-issue-runbooks.md#cf-stack-fails)
+ [Email notification not received after CloudFormation stacks created successfully](res-troubleshooting-issue-runbooks.md#email-invitation-not-received)
+ [Instances cycling or vdc-controller in failed state](res-troubleshooting-issue-runbooks.md#instances-cycling)
+ [Environment CloudFormation stack fails to delete due to dependent object error](res-troubleshooting-issue-runbooks.md#object-error)
+ [Error encountered for CIDR block parameter during environment creation](res-troubleshooting-issue-runbooks.md#cidr-block-error)
+ [CloudFormation stack creation failure during environment creation](res-troubleshooting-issue-runbooks.md#cf-stack-creation-fails)
+ [Creation of external resources (demo) stack fails with AdDomainAdminNode CREATE\_FAILED](res-troubleshooting-issue-runbooks.md#demo-environment-stack-fails)
+ [Identity management issues](res-troubleshooting-issue-runbooks.md#troubleshooting-identity-management)
+ [I am not authorized to perform iam:PassRole](res-troubleshooting-issue-runbooks.md#res-troubleshooting-issue-runbooks-unauth-passrole)
+ [I want to allow people outside of my AWS account to access my Research and Engineering Studio on AWS resources](res-troubleshooting-issue-runbooks.md#res-troubleshooting-issue-runbooks-outside-acct)
+ [When logging into the environment, I immediately return to the login page](res-troubleshooting-issue-runbooks.md#return-to-login)
+ ["User not found" error when trying to log in](res-troubleshooting-issue-runbooks.md#user-not-found)
+ [User added in Active Directory, but missing from RES](res-troubleshooting-issue-runbooks.md#user-missing)
+ [User unavailable when creating a session](res-troubleshooting-issue-runbooks.md#session-user-unavailable)
+ [Size limit exceeded error in CloudWatch cluster-manager log](res-troubleshooting-issue-runbooks.md#sizelimit-exceeded-error)
+ [Storage](res-troubleshooting-issue-runbooks.md#res-troubleshooting-storage)
+ [I created file system through RES but it doesn't mount on the VDI hosts](res-troubleshooting-issue-runbooks.md#res-troubleshooting-storage-created)
+ [I onboarded a file system through RES but it doesn't mount on the VDI hosts](res-troubleshooting-issue-runbooks.md#res-troubleshooting-storage-onboarded)
+ [I am not able to read/write on from VDI hosts](res-troubleshooting-issue-runbooks.md#res-troubleshooting-storage-rw)
+ [Example permission handling use cases](res-troubleshooting-issue-runbooks.md#res-troubleshooting-storage-rw-example)
+ [I created Amazon FSx for NetApp ONTAP from RES but it did not join my domain](res-troubleshooting-issue-runbooks.md#res-troubleshooting-storage-join)
+ [Snapshots](res-troubleshooting-issue-runbooks.md#res-troubleshooting-snapshots)
+ [A Snapshot has a status of Failed](res-troubleshooting-issue-runbooks.md#res-troubleshooting-snapshots-failed)
+ [A Snapshot fails to apply with logs indicating that the tables could not be imported.](res-troubleshooting-issue-runbooks.md#res-troubleshooting-snapshots-not-imported)
+ [Infrastructure](res-troubleshooting-issue-runbooks.md#res-troubleshooting-infrastructure)
+ [Load balancer target groups without healthy instances](res-troubleshooting-issue-runbooks.md#res-troubleshooting-infrastructure-load-balancer)
+ [Launching Virtual Desktops](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops)
+ [I need to launch / resume a large number of VDIs in the RES web portal](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-resume-vdis)
+ [Login account for Windows Virtual Desktop is set to Administrator](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-windows-admin)
+ [Certificate expires when using external resource CertificateRenewalNode](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-certificate-expires)
+ [A virtual desktop that was previously working is no longer able to connect successfully](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-was-working)
+ [I am only able to launch 5 virtual desktops](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-only-five)
+ [Desktop Windows connect attempts fail with "The connection has been closed. Transport error"](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-transport-error)
+ [VDIs stuck in Provisioning state](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-stuck-prov)
+ [VDIs get into Error state after launching](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-error-after)
+ [VDI session goes to a blank screen after logging in](res-troubleshooting-issue-runbooks.md#res-troubleshooting-virtual-desktops-vdi-blank-screen)
+ [Virtual Desktop Component](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-component)
+ [Amazon EC2 instance is repeatedly showing terminated in the console](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-component-ec2-terminated)
+ [vdc-controller instance is cycling due to failing to join AD / eVDI module shows Failed API Health Check](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-component-cycling)
+ [Project does not appear in the pull down when editing the Software Stack to add it](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-component-not-in-pulldown)
+ [cluster-manager Amazon CloudWatch log shows " account not available yet. waiting for user to be synced" (where the account is a user name)](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-component-acct-unavailable)
+ [Windows desktop on login attempt says "Your account has been disabled. Please see your administrator"](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-component-acct-disabled)
+ [DHCP Options issues with external/customer AD configuration](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-component-dhcp)
+ [Firefox error MOZILLA\_PKIX\_ERROR\_REQUIRED\_TLS\_FEATURE\_MISSING](res-troubleshooting-issue-runbooks.md#res-troubleshooting-vd-firefox)
+ [Env deletion](res-troubleshooting-issue-runbooks.md#res-troubleshooting-env-deletion)
+ [res-xxx-cluster stack in "DELETE\_FAILED" state and cannot be deleted manually due to "Role is invalid or cannot be assumed" error](res-troubleshooting-issue-runbooks.md#res-troubleshooting-env-deletion-role-invalid)
+ [Collecting Logs](res-troubleshooting-issue-runbooks.md#res-troubleshooting-env-deletion-collect-logs)
+ [Downloading VDI Logs](res-troubleshooting-issue-runbooks.md#res-troubleshooting-env-deletion-download-logs)
+ [Downloading logs from Linux EC2 instances](res-troubleshooting-issue-runbooks.md#res-troubleshooting-env-deletion-linux-ec2-logs)
+ [Downloading logs from Windows EC2 instances](res-troubleshooting-issue-runbooks.md#res-troubleshooting-env-deletion-windows-ec2-logs)
+ [Collecting ECS logs for the WaitCondition error](res-troubleshooting-issue-runbooks.md#res-troubleshooting-env-deletion-waitcondition)
+ [Demo environment](res-troubleshooting-issue-runbooks.md#res-troubleshooting-demo-env)
+ [Demo environment login error when handling authentication request to identity provider](res-troubleshooting-issue-runbooks.md#demo-environment-login-error)
+ [Demo stack keycloak not working](res-troubleshooting-issue-runbooks.md#demo-environment-stack-keycloak)
+ [Active Directory issues](res-troubleshooting-issue-runbooks.md#active-directory-issues)
+ [My VDI is stuck in the provisioning state for a long time, or I cannot login my VDI as an AD user after the VDI is ready](res-troubleshooting-issue-runbooks.md#active-directory-issues-vdi-stuck)
+ [I cannot login the RES web portal after configuring SSO](res-troubleshooting-issue-runbooks.md#active-directory-issues-res-web-portal)
+ [AD user cannot access the home directory using File Browser even after launching Linux VDIs successfully](res-troubleshooting-issue-runbooks.md#active-directory-issues-home-directory-access)
+ [AD admin user cannot access the Bastion Host after SSH access is enabled](res-troubleshooting-issue-runbooks.md#active-directory-issues-bastion-host-access)
+ [View and manage my Active Directory deployed by RES external resource stack](res-troubleshooting-issue-runbooks.md#active-directory-issues-external-resource-stack)
+ [Known Issues 2024.x](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x)
+ [(2024.12 and 2024.12.01) Regex failure when registering a new Cognito user](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-regex-failure-cognito)
+ [(2024.12.01 and earlier) Invalid bad cert error when connecting to VDI using a custom domain](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-invalid-bad-cert)
+ [(2024.12 and 2024.12.01) Active Directory users cannot SSH to Bastion Host](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-ad-users-cannot-ssh)
+ [(2024.10) VDI auto stop broken for RES environments deployed in isolated VPCs](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-vdi-auto-stop-broken)
+ [(2024.10 and earlier) Failure to launch VDI for Graphic enhanced instance types](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-fail-to-launch-vdi)
+ [(2024.08) Preparing Infrastructure AMI Failure](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-prep-infra-ami-fail)
+ [(2024.08) Virtual desktops fail to mount read/write Amazon S3 bucket with root bucket ARN and custom prefixing](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-vdi-fails-to-mount-s3)
+ [(2024.06) Apply snapshot fails when the AD group name contains spaces](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-apply-snapshot-fails)
+ [(2024.06 and earlier) Group members not synced to RES during AD sync](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-group-not-synced)
+ [(2024.06 and earlier) CVE-2024-6387, RegreSSHion, Security Vulnerability in RHEL9 and Ubuntu VDIs](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-regresshion)
+ [(2024.04-2024.04.02) Provided IAM Permission Boundary not attached to the VDI instances' role](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-iam-boundary)
+ [(2024.04.02 and earlier) Windows NVIDIA instances in ap-southeast-2 (Sydney) fail to launch](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-nvidia-instances)
+ [(2024.04 and 2024.04.01) RES delete failure in GovCloud](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-delete-fail)
+ [(2024.04 - 2024.04.02) Linux virtual desktop may be stuck in the "RESUMING" status on reboot](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-linux-stuck-resuming)
+ [(2024.04.02 and earlier) Fails to sync AD users whose SAMAccountName attribute includes capital letters or special characters](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-samaccountname)
+ [(2024.04.02 and earlier) Private key for accessing the bastion host is invalid](res-troubleshooting-known-issues.md#res-troubleshooting-known-issues-2024x-private-key)