Frequently Asked Question
White Paper: CMS Failover in Surveillance Station 8.0.0 and above
Surveillance Station provides flexible failover options which allow for automatic or manual transfer of services to the backup system during unexpected situations, reducing the risk of data loss or other damages caused by service downtime.
Updated 180208
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- How do I sign in to DS file on Android and transfer files securely?
- How do I access a Synology NAS remotely without exposing unnecessary services?
- Hyper Backup reports insufficient destination quota even though the remote NAS has free space. What should I check?
- DSM says there is insufficient system capacity for an update, but my volume has free space. Why?
- Universal Search is using a lot of Synology CPU. How do I check whether indexing is responsible?
- Synology SMB3 Multichannel is enabled but file copies still use one network link. What should I check?
- Why can I not delete a file or shared folder protected by Synology WriteOnce?
- How do I enable Synology NFS access and fix a mount or permission failure?
- How do I set Synology shared-folder permissions and resolve an unexpected Access Denied?
- How do I find a USB device's VID and PID before checking Synology compatibility?
- Reset a Synology NAS: Mode 1 login recovery vs Mode 2 DSM reinstall
- How to submit a Synology support request from DSM
- Synology SHR vs RAID: fault tolerance, mixed drives and expansion
- Synology MailPlus Server setup: DNS, mailboxes and delivery checks
- Synology FTP, FTPS and SFTP setup and connection checks
- Windows error 1219 appears when I map a second Synology share. How can I reconnect?
- DSM rejects the correct six-digit verification code. Could the time be wrong?
- How do I reconnect Hyper Backup to an existing .hbk backup without starting a new archive?
- Active Backup for Business recovery media cannot see my SSD or network adapter. What should I do?
- Can I move the drives from a failed Synology NAS into a replacement model?
- My HEVC videos upload to Synology Photos but will not play in the browser. How do I fix this?
- Why is Delete unavailable for an immutable Synology snapshot?
- DSM says Test mail failed to send. How do I restore email notifications?
- Synology Drive file versions use far more space than my documents. How do I reduce them safely?
- A Synology Drive file is locked or read-only. Who can unlock it?
- Hyper Backup cannot connect to its destination even though the remote NAS opens in a browser. What should I check?
- Why does Synology Drive keep creating conflict copies of my documents?
- My Synology NAS will not power on. How can I check the power supply safely?
- Why does Synology Active Backup for Business show my PC as offline when it is switched on?
- Why does deleting a Synology Hyper Backup version free less space than expected?
- DS cam shows recordings but sends no motion notifications. What should I check?
- Why is a person missing from the People album in Synology Photos?
- How do I arrange Synology warranty service through ACE and prepare a vendor case?
- Why does Secure SignIn fail to connect after I scan the Approve sign-in QR code?
- Why do my H.265 cameras still record but show a black screen or unsupported-format message on one computer?
- Why can I not add my existing Surveillance Station camera licence to a replacement NAS?
- Why can I watch a Surveillance Station camera live but not find the expected recordings?
- Why does a Surveillance Station camera keep disconnecting while the NAS remains online?
- Why does my Container Manager app stop with permission denied for a mapped folder?
- How do I troubleshoot Active Backup for Business error 0x80042301 on a Windows computer?
- Why is Hyper Backup skipping backups with a timeout waiting for integrity check message?
- Why does Synology Photos stop backing up when my phone screen locks?
- Why can I see Synology Drive files but not open them when I am offline?
- Why can Windows 11 24H2 no longer open my Synology shared folders?
- Why is my Synology volume still full after I delete files?
- Why did my Synology storage pool grow but my volume stay the same size?
- How do I fix a Synology Drive SSL certificate warning without losing my sync tasks?
- Why are photos missing or showing blank thumbnails in Synology Photos?
- Why is Synology QuickConnect slow when my local NAS connection is fast?
- Can I use third-party hard drives in a 2025 Synology DiskStation Plus running DSM 7.3?
- Why does Synology Drive say up to date when some files are missing?
- Resolving Synology NAS Resource Monitor Issues
- How to Enhance the Security of Your Synology NAS
- Swapping Hard Drive Bay Placement in Synology NAS
- NVR: How to enable GPU acceleration on Surveillance Station Client
- NVR: Is Surveillance Station web player compatible with my browser and client operating system?
- Guide: Synology Administrator Training
- General: How to retrieve Synology System Log?
- DS file (iOS)
- What can I do to enhance the wireless transfer performance of my Synology Router?
- General: What can I do to fix slow SMB file transfers on OS X 10.11.5?
- General: Why can't I use Hyper-V over SMB3 to perform Windows Backup on my Synology NAS?
- General: Why can't I use HTTP to configure browser push notifications?
- Storage: How do I enable file self-healing on DSM?
- File Sharing: How to create a Shared Folder?
- NVR: Which Surveillance Station features are currently not available on NVR216 Local Display, VS360HD, and Surveillance Station Client?
- NVR: How do I choose the right PC for Surveillance Station Live View?
- General: Upgrading DS1815+ RAM
- Backup: How to back up your Synology NAS
- NVR: How to make an attempt to install an unsupported IP camera in Surveillance Station? (New)
- Network: Synology Set up OpenVPN on Windows
- File Sharing: Store files to Synology NAS from a Mac computer within the local network
- Network: Synology Set up OpenVPN on Mac
- White Paper: Synology High Availability (SHA) - Shared Storage
- General: Not able to access to Synology NAS
- General: How to change Synology NAS admin & user password?
- Backup & Restore: How to use Cloud Station to backup my PC folder? (For Windows users)
- NVR: How to export IP camera configuration on Synology Surveillance Station?
- Backup & Restore: What backup tasks are monitored by Hyper Backup Vault?
- General: How do I find the suitable Synology NAS to run MailPlus?
- File Sharing: How to map network drives from your Synology NAS Using Synology Assistant?
- NVR: How to operate the fisheye dewarping feature in Surveillance Station?
- Storage: SSD Cache*
- General: How to migrate Evernote notebooks to Note Station?
- Storage: RAID Scrubbing*
- General: Why does my Synology NAS have a single volume size limitation of 16TB?
- Virtualization: Configuring iSCSI port binding with multiple NICs in one vSwitch for VMware ESXi 5.x and 6.0.x
- Virtualization: Considerations for using software iSCSI port binding in ESX/ESXi (2038869)
- NVR: How to customize the transport protocol for my IP camera?
- NVR: How to make an attempt to install an unsupported IP camera in Surveillance Station?
- Multimedia: Can my Synology NAS transcode 4K videos for my device?
- Installation: How do I install an SSD into my Synology NAS for the best SSD cache performance?
- Storage: Which file system should I use to create a volume?
- Virtualization: How to Use Port Binding to Configure Multipathing on VMware for Synology NAS?
- General: Which Synology NAS models support WOL (Wake on LAN)?
- Application: How to connect to Synology's VPN Server using a Windows PC or Mac?
- Backup & Restore: How to retrieve backup files with Hyper Backup Explorer (Windows/Mac/Linux)?
- Cloud Service: How to back up the data in my Google Drive with Synology?
- General: How to fix if my Windows cannot access shared folder?
- General: What is the width of my RackStation server?
- Multimedia: How to embed Photo Station to WordPress, Joomla, Drupal, and other websites?
- Virtualization: How to use iSCSI Targets on Mac computers?
- Storage: How to create a Volume?
- General: What stops my Synology NAS from entering System Hibernation?
- General: How to migrate emails from other mail servers to Synology MailPlus Server?
- General: How to login to DSM with root permission via SSH/Telnet?
- General: How to migrate Synology Mail Server to MailPlus Server?
- Network: LAN/Internet
- Application: Application Portal
- General: What type of fan speed modes are available on my Synology NAS?
- General: Can I create a high-availability cluster with two different Synology NAS servers?
- Storage: How to repair a Volume or Disk Group?
- Application: How to create and manage your to-do list with Note Station?
- Application: How to install and use the Google Chrome App for Note Station?
- General: Why does Security Advisor inform me of modified system files?
- Storage: Which models have limited support to Synology Hybrid RAID (SHR)?
- SRM: How come the "Oops! Website blocked!" page does not pop up even when a website has been blocked by my custom Web-filter?
- Cloud Service: How to back up the data on your Synology NAS to the public cloud?
- Application: How to install applications with Package Center?
- Virtualization: How to Use iSCSI Targets on VMware ESXi Server with Multipath Support?
- General: What is Synology DDNS Service?
- General: What kind of CPU does my Synology NAS have?
- Application: How to set up VPN Server in Synology NAS?
- File Sharing: Store files to Synology NAS from a Windows PC within the local network
- White Paper: Synology High Availability (SHA)
- Multimedia: Can my Synology NAS transcode videos for my device?
- Storage: Does the eSATA port of Synology products support eSATA disk enclosures with port multipliers?
- Backup & Restore: What backup software does my Synology NAS support?
- Storage: Which Synology DiskStation/RackStation can I use with Synology Expansion Units?
- SRM: Can Synology Router RT1900ac works with Singtel Mio TV?
- File Sharing: How can I use File Station to access files on my Mac computer?
- NVR: What joystick does Synology Surveillance Station support?
- Application: What is Synology Cloud Sync Decryption Tool?
- Storage: How to increase Synology Storage Raid rebuild speed?
- General: Why are the LED indicators on the LAN ports of my Synology NAS not working?
- Network: How to register Synology DNS server IP with Singtel Aztech Router?
- NVR: Why is Surveillance Station plugin deactivated after the installation? (NPAPI issue for Google Chrome version 44 and older)
- NVR: How do I install Surveillance Station plugin on Internet Explorer to enable Surveillance Station Live View?
- General: Unable to map network drive - System Error 67
- Storage: Choose a RAID Type
- White Paper: Synology QuickConnect
- Backup & Restore: How to use Cloud Station to sync files between Synology NAS and Windows computers
- General: What can I do if the STATUS LED keeps flashing in orange?
- NVR: How to add camera to Synology Surveillance Station?
- General: How to create a high-availability configuration with Synology NAS?
- General: Why are Skype and MSN push notifications no longer supported in DSM?
- Application: How to join the Synology NAS to the LDAP directory service
- Storage: How can I recover data from my DiskStation using a PC?
- General: How to choose the right HDD for my Synology NAS?
- General: What is the RESET button on the Synology product for?
- General: What USB3.0 external storage devices are supported by Synology NAS?
- General: What network ports are used by Synology services?
- General: What UPS (Uninterruptible Power Supply) devices do Synology product support?