ZcashMiner can't connect. Connection refused


after one day of successful working ZcashMiner can't establish a connection now. It stop working after 18314 block.
I see this line in a log:
connect() to failed after select(): Connection refused (111)
Ping to alphatestnet.z.cash ( goes successfully.

Can not connect to Zcash's node

The testnet has been reset for an updated version of the software. Delete all your old zcash folders and start over.


Thank you,
and as I understand, I have not to delete only but to update and compile again in this way:
git fetch origin
git checkout zc.v0.11.2.z5
./zcutil/build.sh -j8
Delete old testnet data: rm -rf ~/.zcash/testnet3/