This issue also applies (though not explicitly stated in the article) for the Linchpin Mobile on-Site Gateway. Simply replace the //SEIBERT/MEDIA Linchpin Mobile Cloud Gateway's IP address by your internal Gateway's IP.


The Confluence instance running behind a firewall with no access to the public internet cannot connect to the Linchpin Mobile Cloud Gateway hosted by //SEIBERT/MEDIA. When establishing a connection via the Confluence admin panel there's a popup displaying the following error message.

UnknownHostException: Name or service not known


The Linchpin Mobile Confluence App needs to connect to the Linchpin Mobile Cloud Gateway hosted by //SEIBERT/MEDIA via the internet.

If your firewall is blocking all outgoing connections the Linchpin Mobile Confluence App isn't able to communicate with the Gateway.


To resolve this issue add a whitelist entry to your firewall to accept outgoing HTTPS connections on port 443 to the IP and the URLs and (//SEIBERT/MEDIA hosted Linchpin Mobile Gateway). Please also make sure that the Confluence system is able to do a DNS-resolution for the hosts and

Please be aware that this IP address can change any time in the future. In order to get a notification about upcoming IP changes please contact us.

Looking for an alternative to port whitelisting?

If you do not want to put a port whitelisting in place or if whitelisting is restricted by your company's security guidelines get more information on our on-site Linchpin Mobile Gateway that can be hosted within your company's infrastructure.

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Still need help?

If this solution doesn't work for you feel free to contact us via email or get in touch with us here.

This content was last updated on 11/22/2021.

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