| `WEBSITE_ADD_SITENAME_BINDINGS_IN_APPHOST_CONFIG` | After slot swaps, the app may experience unexpected restarts. This is because after a swap, the hostname binding configuration goes out of sync, which by itself doesn't cause restarts. However, certain underlying storage events (such as storage volume failovers) may detect these discrepancies and force all worker processes to restart. To minimize these types of restarts, set the app setting value to `1`on all slots (default is`0`). However, don't set this value if you're running a Windows Communication Foundation (WCF) application. For more information, see [Troubleshoot swaps](deploy-staging-slots.md#troubleshoot-swaps)||
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