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Undistribute commands, distributor to subscriber history query timeout

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greetings, have set up a new subscriber for an existing publication. the publisher is a 2008 r2 instance, with 2 existing 2008 r2 and now 1 an additional subscriber which is 2014, all on different servers on the same network. I reinitialized the new subscriptions and ran the snapshot jobs. I had truncated 1 of the tables on the subscriber so I could verify it was actually working as it should eventually have data in the table after the snapshots complete. I have seen some latency so I gave the processes time to complete/push data from distributor to subscribers, but I noticed that I was not getting data in the table i was monitoring. I saw in the distributor to subscriber history there was a query timeout error message and the message the process is running and waiting for a response from the server. I had 582 undistributed commands, and that count was not moving. After an hour of waiting, I restarted the sql service on the distributor, it the undistributed command count did not budge. I then restarted the sql service on the subscriber, and shortly after that the undistributed commands started getting applied. It seems now to have worked but i would like another opinion of what was going on (just latency) or was something hung up and I needed to restart those services? would have liked to been able to get past this without a service restart.  thanks

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