I did it. According to a local network with other machines, the wallet is connected via IP successfully , but writes Failed to update block...
Is your wallet fully synced?
You also need to add the ip's of all your other local machines that are mining to that wallet to the nexus.conf file. You can use wildcard **, eg 192.168.0.**
If that does not work, come into the Slack channel and someone more knowledgeable will help u.