|Replication|Replication connections to [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] use the typical regular [!INCLUDE[ssDE](../../includes/ssde-md.md)] ports (TCP port 1433 for the default instance, etc.)<br /><br /> Web synchronization and FTP/UNC access for replication snapshot require additional ports to be opened on the firewall. To transfer initial data and schema from one location to another, replication can use FTP (TCP port 21), or sync over HTTP (TCP port 80) or File Sharing. File sharing uses UDP port 137 and 138, and TCP port 139 if it using NetBIOS. File Sharing uses TCP port 445.|For sync over HTTP, replication uses the IIS endpoint (ports for which are configurable but is port 80 by default), but the IIS process connects to the backend [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] through the standard ports (1433 for the default instance.<br /><br /> During Web synchronization using FTP, the FTP transfer is between IIS and the [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] publisher, not between subscriber and IIS.|
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