Credential and Authentication Errors
Use when the VM is reachable but sign-in fails.
Symptoms -> Solutions
| Symptom | OS | Action | Docs |
|---|---|---|---|
| credentials failed, must change password, account expired | Windows | Reset password; extend account if needed | [Reset RDP] |
| trust relationship failed | Windows | Reset machine account or rejoin domain | [RDP overview] |
| access denied, connection denied, wrong local/domain format | Windows | Add Remote Desktop Users; use VMNAME\user or DOMAIN\user | [RDP errors] |
| CredSSP encryption oracle | Windows | Temporary client workaround; patch both sides | [CredSSP] |
| permission denied publickey/password | Linux | Verify user/key/password auth; reset key/password if needed | [SSH detail] |
| locked account | Linux | Unlock via Run Command or Serial Console | [SSH overview] |
| Entra ID SSH denied | Linux | Assign VM Admin/User Login role | [SSH overview] |
| sudo prompt fails | Linux | Fix sudoers via Run Command or Serial Console | [SSH overview] |
Quick Commands
Commands use VM agent/extensions. Run Pre-Flight Safety Checks first.
bash
# Windows password / RDP reset