diff --git a/letsencrypt/client/client.py b/letsencrypt/client/client.py
index 7516eee05..9b1b186e1 100644
--- a/letsencrypt/client/client.py
+++ b/letsencrypt/client/client.py
@@ -16,6 +16,7 @@ from letsencrypt.client import apache_configurator
 from letsencrypt.client import CONFIG
 from letsencrypt.client import crypto_util
 from letsencrypt.client import display
+from letsencrypt.client import errors
 from letsencrypt.client import le_util
 from letsencrypt.client import logger
 
@@ -328,7 +329,7 @@ class Client(object):
                              (msg_dict["error"],
                               msg_dict.get("message", ""),
                               msg_dict.get("moreInfo", "")))
-                raise Exception(msg_dict["error"])
+                raise errors.LetsEncryptClientError(msg_dict["error"])
 
             elif msg_dict["type"] == "defer":
                 logger.info("Waiting for %d seconds..." % delay)
diff --git a/letsencrypt/client/errors.py b/letsencrypt/client/errors.py
new file mode 100644
index 000000000..288da35cf
--- /dev/null
+++ b/letsencrypt/client/errors.py
@@ -0,0 +1,5 @@
+"""Let's Encrypt client errors."""
+
+
+class LetsEncryptClientError(Exception):
+    """Generic Let's Encrypt client error."""
diff --git a/letsencrypt/client/logger.py b/letsencrypt/client/logger.py
index ac1b85033..0b5513ed6 100644
--- a/letsencrypt/client/logger.py
+++ b/letsencrypt/client/logger.py
@@ -5,6 +5,7 @@ import time
 import dialog
 
 from letsencrypt.client import display
+from letsencrypt.client import errors
 
 
 class Singleton(object):
@@ -35,7 +36,7 @@ class Logger(Singleton):
         return self.debugLevelStr[level]
 
     def log(self, level, data):
-        raise Exception("Error: no Logger defined")
+        raise errors.LetsEncryptClientError("No Logger defined")
 
     def timefmt(self, t=None):
         if t == None: