This is the most recommended method because it uses a valid certificate and lets you connect directly to Synology NAS server.

1. If you want to access your Synology NAS from external connections, set up port forwarding rules for your Synology NAS¹:
   • Forward ports 5000 and 5001 for DSM (configured by default)
   • Forward port 6690 for file syncing via Synology Drive
2. Set up DDNS for your Synology NAS. On the same page, apply for a Let's Encrypt certificate and set it as the default certificate. Refer to the respective help articles for DSM 7.0 and above and DSM 6.2 and earlier.
   1. If you already have a valid certificate, import the certificate into your Synology NAS.²
   2. Once you have completed the DDNS and certificate setup, go to Control Panel > Security > Certificate to make sure that your valid certificate is set as the default and is used for Synology Drive Server. If not, refer to the respective help article for DSM 7.0 and above and DSM 6.2 and earlier to manually adjust it.

   

3. Once the domain name with a valid certificate is set up, you can use it to connect to your Synology NAS on Synology Drive Client, Synology Drive ShareSync, or Synology Drive mobile app.

QuickConnect allows you to quickly establish the connection to Synology Drive Server, even when your Synology NAS is under a limited network environment. However, in certain circumstances, you may still encounter the untrusted SSL warning when connecting via QuickConnect.

1. If you want to access your Synology NAS from external connections, set up port forwarding rules for your Synology NAS¹:
   • Forward ports 5000 and 5001 for DSM (configured by default)
   • Forward port 6690 for Synology Drive
   Skip this step if your network environment does not allow you to set up port forwarding for your Synology NAS.
2. Set up DDNS for your Synology NAS. On the same page, apply for a Let's Encrypt certificate and set it as the default certificate. Refer to the respective help articles for DSM 7.0 and above and DSM 6.2 and earlier.
   • Once you have completed DDNS and Let's Encrypt certificate setup, go to Control Panel > Security > Certificate to make sure that your valid certificate is set as the default and is used for Synology Drive Server. If not, refer to the respective help article for DSM 7.0 and above and DSM 6.2 and earlier to manually adjust it.

   

3. Enable QuickConnect service (refer to the "Set up QuickConnect" section). Under the Advanced section, click Advanced Settings, and make sure the options Enable QuickConnect relay service and Automatically create port forwarding rules are enabled.
4. Use the QuickConnect ID you just set up to connect to your Synology NAS on Synology Drive Client, Synology Drive ShareSync, or Synology Drive mobile app.^{3 4 5}

Using other connection methods without a valid certificate will trigger the SSL warning. Refer to the following scenarios and their respective solutions.

Sign in using an IP address

If you are sure that the IP address is correct, you can manually trust the connection by clicking the proceed button.

Sign in via a self-signed or expired certificate

Apply for a Let's Encrypt certificate and use it to replace the invalid one.

Missing an intermediate certificate

If the certificate authority provided an intermediate certificate, you must import it as well.