diff --git a/src/net/Client.cpp b/src/net/Client.cpp
index fde7f4802..c2518be93 100644
--- a/src/net/Client.cpp
+++ b/src/net/Client.cpp
@@ -199,6 +199,28 @@ int64_t Client::submit(const JobResult &result)
 }
 
 
+bool Client::isCriticalError(const char *message)
+{
+    if (!message) {
+        return false;
+    }
+
+    if (strncasecmp(message, "Unauthenticated", 15) == 0) {
+        return true;
+    }
+
+    if (strncasecmp(message, "your IP is banned", 17) == 0) {
+        return true;
+    }
+
+    if (strncasecmp(message, "IP Address currently banned", 27) == 0) {
+        return true;
+    }
+
+    return false;
+}
+
+
 bool Client::parseJob(const json_t *params, int *code)
 {
     if (!json_is_object(params)) {
@@ -405,7 +427,7 @@ void Client::parseResponse(int64_t id, const json_t *result, const json_t *error
             LOG_ERR("[%s:%u] error: \"%s\", code: %" PRId64, m_url.host(), m_url.port(), message, json_integer_value(json_object_get(error, "code")));
         }
 
-        if (id == 1 || (message && strncasecmp(message, "Unauthenticated", 15) == 0)) {
+        if (id == 1 || isCriticalError(message)) {
             close();
         }
 
diff --git a/src/net/Client.h b/src/net/Client.h
index b7eda3257..f554e3417 100644
--- a/src/net/Client.h
+++ b/src/net/Client.h
@@ -77,6 +77,7 @@ public:
 private:
     constexpr static size_t kRecvBufSize = 4096;
 
+    bool isCriticalError(const char *message);
     bool parseJob(const json_t *params, int *code);
     bool parseLogin(const json_t *result, int *code);
     int resolve(const char *host);