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My backend died and I had to reinstall; I downloaded the 16.04 ISO and went through the install process, then installed all of the updates and configured. I appear to have almost everything running - but I have no guide data, and running MythFillDatabase generates errors. Here is my MythTV version

Sep 9 16:39:40 Hollywood mythbackend: mythbackend[1085]: C thread_unknown mythcommandlineparser.cpp:2599 (ConfigureLogging) mythbackend version: fixes/0.28 [v0.28.2-6-g9031599]

I can't copy/paste from the window in which the Mythfilldatabase logs appear, but here are what appear to be the most important lines:
I dbSchema 1344
I Connecting to backend server: 192.168.3.203:6543
E Failed to connect to (127.0.0.1:6543) Connection refused
I No channels are configured to use the grabber

The mythfilldatabase log file contains no errors, but neither is it current - the last entries are from yesterday, and I have run Mythfilldatabase several times today.

Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext schemawizard.cpp:120 (Compare) Current MythTV Schema Version (DBSchemaVer): 1344
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext mythcorecontext.cpp:436 (ConnectCommandSocket) MythCoreContext::ConnectCommandSocket(): Connecting to backend server: 192.168.3.203:6543 (try 1 of 1)
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext mythcorecontext.cpp:1578 (CheckProtoVersion) MythCoreContext::CheckProtoVersion(): Using protocol version 88 XmasGift
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext main.cpp:311 (main) Opening blocking connection to master backend
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext filldata.cpp:569 (Run) Updating source #1 (Antenna) with grabber schedulesdirect1
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext filldata.cpp:588 (Run) No channels are configured to use grabber.
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext filldata.cpp:212 (GrabDDData) Retrieving datadirect data.
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext filldata.cpp:215 (GrabDDData) Grabbing ALL available data.
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext datadirect.cpp:1172 (GrabData) DataDirect: Grabbing listing data
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext datadirect.cpp:1023 (DDPost) Downloading DataDirect feed
Sep 8 17:05:37 Hollywood mythfilldatabase: mythfilldatabase[2562]: I LogForward loggingserver.cpp:295 (SyslogLogger) Added syslogging
Sep 8 17:05:59 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext datadirect.cpp:1035 (DDPost) Downloaded 2127416 bytes
Sep 8 17:05:59 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext datadirect.cpp:1037 (DDPost) Uncompressing DataDirect feed
Sep 8 17:05:59 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext datadirect.cpp:1042 (DDPost) Uncompressed to 26074849 bytes
Sep 8 17:05:59 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext datadirect.cpp:1048 (DDPost) Writing to temporary file: [/tmp/mythtv_ddp_QSQSjg/mythtv_ddp_ysN3Ul]
Sep 8 17:05:59 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext mythdbcon.cpp:449 (getStaticCon) New static DB connectionDataDirectCon
Sep 8 17:05:59 Hollywood mythfilldatabase: mythfilldatabase[2562]: I CoreContext datadirect.cpp:464 (characters) DataDirect: Your subscription expires on Sun Jun 9 2019 10:55 PM

Sysctrl confirms that the backend is running, and the IP address that mythfilldatabase is using matches what is shown by ifconfig. What should be my next troubleshooting steps?

Hi, I'd fix this line 1st: It means that all channels had an empty XMLTVID.