do it before, and return false instead of going into a loop, so cli will work

src/main.cpp

@@ -2051,6 +2051,13 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
     const CChainParams& chainparams = Params();
     AssertLockHeld(cs_main);
 
+    int64_t FORK_HEIGHT = 232173;
+
+    // hit the pause button
+    if(pindex->nHeight > FORK_HEIGHT) {
+        printf("Past fork height, sleepytime!\n");
+	return false;
+    }
     bool fExpensiveChecks = true;
     if (fCheckpointsEnabled) {
         CBlockIndex *pindexLastCheckpoint = Checkpoints::GetLastCheckpoint(chainparams.Checkpoints());