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Synology troubleshooting — common problems, fixed

Answers to the most common Synology NAS problems and error messages, sourced from 20 years of community solutions and the official docs. Pick your issue, or ask the AI your exact question.

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Storage

Expand a Synology volume / replace with bigger drives Replace a failed drive in Synology and rebuild Synology 'System Partition Failed' — how to fix Synology Btrfs vs ext4 — which to choose Synology RAID rebuild very slow Synology SSD cache — worth it and how to set up Synology Snapshot Replication against ransomware Synology drive with bad sectors / Critical status Synology not recognizing a hard drive Synology out of space — how to free it up Synology storage pool degraded — what to do Synology volume crashed — how to recover your data Synology volume is read-only — how to fix

Backup

Back up Synology to the cloud (C2, Backblaze)Restore from Synology Hyper Backup Synology Active Backup for Business keeps failing Synology Cloud Sync stopped syncing Synology Hyper Backup failed or stuck Synology USB Copy not working Use Synology as a Time Machine backup for Mac

Network

Can't connect to Synology remotely Set a static IP on your Synology NAS Set up Link Aggregation / bonding on Synology Set up Tailscale on Synology for remote access Set up a VPN server on Synology Set up a WireGuard VPN on Synology Set up a reverse proxy on Synology DSM Set up port forwarding for a Synology service Synology AFP deprecated — connect a Mac via SMB Synology DDNS error / not updating Synology Let's Encrypt certificate fails Synology QuickConnect not working Synology SMB shares not connecting from Windows Synology slow file transfer speeds

Security

Audit which Synology services are exposed to the internet Create a least-privilege user instead of using admin Disable SMB1 and enable SMB signing on Synology Respond to a Synology security advisory & patch safely Secure remote access to Synology without QuickConnect Set up 2FA / Secure SignIn on Synology Set up a secure reverse proxy with HTTPS on Synology Synology NAS hacked or brute-forced — what to do Synology firewall rules + GeoIP blocking Synology immutable snapshots against ransomware Synology ransomware recovery — files encrypted Synology security hardening checklist

System

Check Synology logs (Log Center) to diagnose issues Connect a UPS to Synology for safe shutdown Forgot Synology admin password — how to reset How to reset a Synology NAS (Mode 1 vs Mode 2)Locked out of Synology 2-step verification Migrate from DSM 6 to DSM 7 safely Migrate to a new Synology and keep your data Move a Synology package to another volume Run scheduled tasks / cron on Synology Should you update to DSM 7.2 — what changes Synology DSM update failed or stuck Synology degraded after a power outage Synology status 'Migratable' — what it means

Apps

Add an ONVIF / RTSP camera to Surveillance Station Host a website with Web Station / PHP on Synology Migrate from Google Photos to Synology Photos Plex hardware transcoding on Synology Running Docker / Container Manager on Synology Set up a mail server on Synology Set up face recognition in Synology Photos Set up phone photo auto-backup to Synology Photos Share albums and links in Synology Photos Surveillance Station camera offline / won't connect Surveillance Station recording / retention not working Synology Download Station not downloading Synology Drive client not syncing Synology Moments vs Photos — how to migrate Synology Note Station not syncing Synology Photos not showing photos / thumbnails Synology Surveillance Station camera licenses Use docker-compose in Synology Container Manager Video Station removed in DSM 7.2 — alternatives View Surveillance Station cameras remotely in DS cam

Hardware

Add RAM to Synology — how much and which Add an expansion unit (DX/RX) to Synology Create an M.2 NVMe storage pool on Synology Synology 'found no hard disk' at startup Synology NAS overheating — how to cool it down Synology beeping continuously — what it means Synology drive compatibility — non-Synology drives Synology fan error alert but fan is spinning Synology fan running loud / at full speed Synology won't boot — blue light blinking Third-party drives in 2025 Synology Plus models (DS925+, DS1825+)

Performance

Synology DSM web interface is slow Synology high CPU / memory usage Synology media indexing causing high CPU