How to Access Synology Services Remotely via the Internet

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This page is currently inactive since May 20, 2011 and is retained for historical/archival reference.
Please look refer to the Remote Access on the Synology DiskStation article for the newest revision of this article.

The Synology server has internet services (such as Web hosting, PhotoStation 2 + video) which are designed for internet use. These services by default are not publicly viewable (also, some of these services must be enabled before use), these services can be accessed over the Internet by port forwarding the corrosponding port from the WAN (the Internet) to the LAN IP address of the Cube Station.

Ports for example, are specific access “doors” which various computers will respond too. Much akin to forwarding a phone call from New York, NY to Seattle, WA; port forwarding forwards a call from the Internet, to the local network, and into the Cube Station, where the Cube Station (or Synology Product) will pick up the call and respond.

Given today's plethora of routers, there is no standardized guide or method on how to instruct new users on how to forward ports, most common locations on where to find the port forwarding settings on routers is are

  • Advanced Services
  • Firewall Settings
  • Port Forward
  • Virtual Server

A recommended website which as a collection of guides from various routers on how to conduct port forwarding is Using the guides from, please use one example of forwarding a mail server, for example, to a specific server. It will tell you how to change the port number, from there, simply change the port numbers and add as many services that are needed within the router settings.

What is my external IP address?

To determine what is the external IP address of your system, you may use This address will have to be used to access the Synology product remotely over the Internet.

How do I test if my ports are forwarded correctly?

To determine if the ports are forwarded correctly, you may use to probe your network.

DNS Alias

All Internet connections today are assigned an IP address, which may be Static (fixed) IP, or a Dynamic (variable, constantly changing on an interval) IP. To have it where it's easier to remember what the IP address is to a particular location is, names are often used, such as DynamicDNS is a website which offers name address, and at the time this article was written, users can sign up for one free DNS name for home and personal use. This will make it easier for users to distribute their online content on the Internet.

List of ports that the Synology Product uses

Please refer to the following list of ports which the Synology server can use. Some of these ports, such as the Synology Assistant need these ports opened on the local computer firewall for these applications to operate correctly.

  • Special thanks to Loeffel for performing the initial compilation of this data.
  • List of ports compiled by Synology

Port Protocol Description Notes
20 TCP FTP-Data
22 TCP SSH/Encrypted Network Backup
23 TCP Telnet
25 TCP Mail Station SMTP
53 TCP Domain Name Service Name Resolution
67 UDP DHCP Client So the NAS can get an IP, normally not needed
80 TCP PhotoStation 2 + Video, Web Service Other ports can be added, in case 80 is not available.
110 TCP Mail Station POP3
123 UDP Network Time Protocol NTP Server
138 UDP NetBIOS-Datagram
143 TCP Mail Station IMAP
139 UDP NetBIOS-ssn
389 TCP/UDP LDAP For ADS Connection
443 TCP HTTPS Secured Web Service
445 TCP/UDP Microsoft-ds Also named CIFS or mentioned as Samba (shares of the NAS)
537 Network Media Streaming Protocol
548 TCP Apple Filing Protocol
554 TCP/UDP Real Time Stream Protocol
873 TCP Encrypted/Network Backup Rsync
989 TCP FTP-Data over TLS/SSL
990 TCP FTP over TLS/SSL
993 TCP Mail Station IMAP over SSL/TLS
995 TCP Mail Station POP3 over SSL/TLS
3260 TCP iSCSI
3306 TCP/UDP MySQL Service
3689 TCP DAAP Digital Audio Access Protocol used by Apple’s iTunes
4662 TCP eMule
4672 UDP eMule
5000 TCP Synology Management Console, File Station, Audio Station
5001 TCP Secured Synology Management Console, File Station, Audio Station
5432 TCP/UDP Download Redirector
5353 iTunes Media Service
6881-6890 TCP BitTorrent (before firmware v2.0.1-3.0401 you also need the ports 6891-6999)
9997-9999 UDP Various Synology Client Utilities, such as Synology Assistant, Download Redirector, Data Replicator, USB Assistant
55536-56559 TCP Default Passive FTP Range
55736-55863 TCP Surveillance Station

Further reading

Wikipedia:Computer Network
Wikipedia:Local Area Network
Wikipedia:Wide Area Network
Wikipedia:Port Forwarding
Wikipedia:TCP and UDP Port
Wikipedia:List of TCP and UDP Port Numbers