Subsonic Forum

Hello,
I haven't used SubSonic for a long time and I am trying to set it up again in my new house (new ISP Proximus, new router bbox3). Static adress has been manually set. But so far, no success: log says "no UPnProuter found" and i can't reach the server from other computer on my lan. The complete log mentions a few UnknownHostException like this one:
[2019-01-19 10:16:14,034] WARN SettingsService - Failed to validate license.
java.net.UnknownHostException: subsonic.org: Name or service not known
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:111)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
.....

Looks like a DNS problem, I solved other UnknownHostExceptions by modifying a config file about localhost, which other config files should i look into? I use OpenSuse Tumbleweed.Thanks!