diff --git a/lib/travis/client/session.rb b/lib/travis/client/session.rb
index 76da2cf9..e62232e0 100644
--- a/lib/travis/client/session.rb
+++ b/lib/travis/client/session.rb
@@ -218,7 +218,12 @@ def raw(verb, url, *args)
         when 301, 303      then raw(:get, result.headers['Location'])
         when 302, 307, 308 then raw(verb, result.headers['Location'])
         when 401           then raise Travis::Client::NotLoggedIn,      'not logged in'
-        when 403           then raise Travis::Client::NotLoggedIn,      'invalid access token'
+        when 403           then
+          if headers.key?("Authorization")
+            raise Travis::Client::NotLoggedIn,      'invalid access token'
+          else
+            raise Travis::Client::Error, "received 403 from %s; your IP may have been blacklisted" % [uri + url]
+          end
         when 404           then raise Travis::Client::NotFound,         result.body
         when 422           then raise Travis::Client::ValidationFailed, result.body
         when 400..499      then raise Travis::Client::Error,            "%s: %p" % [result.status, result.body]