diff --git a/gateway/platforms/slack.py b/gateway/platforms/slack.py
index 2116b569f96..5accfdb4108 100644
--- a/gateway/platforms/slack.py
+++ b/gateway/platforms/slack.py
@@ -482,7 +482,7 @@ class SlackAdapter(BasePlatformAdapter):
             "text": text,
         }
         try:
-            async with aiohttp.ClientSession() as session:
+            async with aiohttp.ClientSession(trust_env=True) as session:
                 async with session.post(
                     ctx["response_url"],
                     json=payload,
diff --git a/gateway/platforms/sms.py b/gateway/platforms/sms.py
index 2cf7db69b74..9d9957d5ea1 100644
--- a/gateway/platforms/sms.py
+++ b/gateway/platforms/sms.py
@@ -128,6 +128,7 @@ class SmsAdapter(BasePlatformAdapter):
         await site.start()
         self._http_session = aiohttp.ClientSession(
             timeout=aiohttp.ClientTimeout(total=30),
+            trust_env=True,
         )
         self._running = True
 
@@ -169,6 +170,7 @@ class SmsAdapter(BasePlatformAdapter):
 
         session = self._http_session or aiohttp.ClientSession(
             timeout=aiohttp.ClientTimeout(total=30),
+            trust_env=True,
         )
         try:
             for chunk in chunks:
diff --git a/plugins/platforms/google_chat/adapter.py b/plugins/platforms/google_chat/adapter.py
index d8777bf7101..1520d6664eb 100644
--- a/plugins/platforms/google_chat/adapter.py
+++ b/plugins/platforms/google_chat/adapter.py
@@ -3246,7 +3246,7 @@ async def _standalone_send(
         return {"error": "Google Chat standalone send: aiohttp not installed"}
 
     try:
-        async with _aiohttp.ClientSession(timeout=_aiohttp.ClientTimeout(total=30.0)) as session:
+        async with _aiohttp.ClientSession(timeout=_aiohttp.ClientTimeout(total=30.0), trust_env=True) as session:
             async with session.post(
                 url,
                 json=body,
diff --git a/plugins/platforms/teams/adapter.py b/plugins/platforms/teams/adapter.py
index c71baeb9d93..f8a1dc3d5b4 100644
--- a/plugins/platforms/teams/adapter.py
+++ b/plugins/platforms/teams/adapter.py
@@ -566,7 +566,7 @@ async def _standalone_send(
         # Per-request timeouts so a slow STS endpoint cannot starve the
         # subsequent activity POST of its budget.
         per_request_timeout = _aiohttp.ClientTimeout(total=15.0)
-        async with _aiohttp.ClientSession() as session:
+        async with _aiohttp.ClientSession(trust_env=True) as session:
             async with session.post(
                 token_url,
                 data={