Today, I have upgraded the Splunk version to 7.1.2 in my lab environment which contains 20 Universal forwarders with Indexer Clustered and distributed Search Head.
Since the upgrade, Status of Deployment Clients is showing as last phone home 5min ago. But clients are phoning home and sending logs as well. Do I need to make any changes in files or is it a known issue? Thanks in advance.
It could be a checksum error from your UF's. Could you please share any errors you may have in _internal regarding phone home ?
You could try going on one of the UF's deleting the instance.cfg file from splunkforwarder/etc and restarting.