diff --git a/vllm/envs.py b/vllm/envs.py
index 832d031f998ec..94b0dece9655d 100755
--- a/vllm/envs.py
+++ b/vllm/envs.py
@@ -155,7 +155,7 @@ if TYPE_CHECKING:
     VLLM_MSGPACK_ZERO_COPY_THRESHOLD: int = 256
     VLLM_ALLOW_INSECURE_SERIALIZATION: bool = False
     VLLM_NIXL_SIDE_CHANNEL_HOST: str = "localhost"
-    VLLM_NIXL_SIDE_CHANNEL_PORT: int = 5557
+    VLLM_NIXL_SIDE_CHANNEL_PORT: int = 5600
     VLLM_ALL2ALL_BACKEND: Literal["naive", "pplx",
                                   "deepep_high_throughput",
                                   "deepep_low_latency",
@@ -1220,7 +1220,7 @@ environment_variables: dict[str, Callable[[], Any]] = {
 
     # Port used for NIXL handshake between remote agents.
     "VLLM_NIXL_SIDE_CHANNEL_PORT":
-    lambda: int(os.getenv("VLLM_NIXL_SIDE_CHANNEL_PORT", "5557")),
+    lambda: int(os.getenv("VLLM_NIXL_SIDE_CHANNEL_PORT", "5600")),
 
     # all2all backend for vllm's expert parallel communication
     # Available options: