I have the same issue on my local machine with the release “grin-v0.4.2-464718698-osx.tgz”.
Also tried to change the seeding type to “List” and hardcoded some seeds. But didn’t help.
From the log:
20181228 12:57:08.288 DEBUG grin_servers::seed - monitor_peers: on 0.0.0.0:13414, 0 connected (0 most_work). all 0 = 0 healthy + 0 banned + 0 defunct
20181228 12:57:08.288 DEBUG grin_servers::seed - monitor_peers: no preferred peers
20181228 12:57:08.288 DEBUG grin_servers::seed - monitor_peers: no dandelion relay updating
20181228 12:57:08.288 DEBUG grin_p2p::peers - Could not update dandelion relay
20181228 12:57:13.194 WARN grin_servers::sync::syncer - sync: no peers available, disabling sync