This is the sync.blue® Access Server
The sync.blue® Access Server enables synchronization with the cloud service sync.blue® from an internal (inaccessible from the outside) company network. Technically speaking, it is an SSH server to which an SSH tunnel can be actively established from the internal network. sync.blue® can then use this to access selected resources in the internal network (e.g. an internal database, an ERP system,...).
The sync.blue® Access Server is therefore a straightforward alternative to setting up a complex VPN.
How it works
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An SSH client in the private network starts and actively connects to the sync.blue® Access Server to make the internal app accessible.
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The sync.blue® sync server establishes a connection via the sync.blue® Access Server (not directly to the internal app).
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This allows the sync.blue® sync server to indirectly access the internal app in the private network to synchronize contacts.
In practice
Step 1
Install an SSH client on a computer in your private network. Then run the following SSH command on this computer (or an corresponding command for the operating system you are using):
ssh -R 0.0.0.0:ANY_PORT:INTERNAL_APP_IP:INTERNAL_APP_PORT -N access@access.sync.blue
* ANY_PORT: Choose a port between 5000 and 6000. If you receive the warning "Warning: remote port forwarding failed for listen port XXX" , choose a different port number.
* INTERNAL_APP_IP: the IP address of your internal app, such as 192.168.1.100
* INTERNAL_APP_PORT: the local port of your app, such as 443 (HTTPS)
When prompted, enter the password "access" .
After executing the command, your internal app is only accessible to sync.blue® via the address access.sync.blue:ANY_PORT and can thus be synchronized.
Step 2
Configure your sync.blue® app as usual, but with a different server name and port. Here is an example for the app "STARFACE":
Tenant: access.sync.blue (instead of internal IP such as 192.168.1.100)
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