diff --git a/include/network/network_downloader.hpp b/include/network/network_downloader.hpp
index 4b98b979..5914f567 100644
--- a/include/network/network_downloader.hpp
+++ b/include/network/network_downloader.hpp
@@ -9,6 +9,7 @@
 struct NetworkStream {
 	static constexpr u64 BLOCK_SIZE = 0x40000; // 256 KiB
 	static constexpr u64 MAX_CACHE_BLOCKS = 12 * 1000 * 1000 / BLOCK_SIZE;
+	static constexpr int RETRY_CNT_MAX = 1;
 	
 	u64 block_num = 0;
 	std::string url;
@@ -23,6 +24,7 @@ struct NetworkStream {
 	volatile bool suspend_request = false;
 	volatile bool quit_request = false;
 	volatile bool error = false;
+	volatile int retry_cnt_left = RETRY_CNT_MAX;
 	volatile u64 read_head = 0;
 	const char * volatile network_waiting_status = NULL;
 	bool disable_interrupt = false;
diff --git a/include/network/network_io.hpp b/include/network/network_io.hpp
index e1a33a90..f446290b 100644
--- a/include/network/network_io.hpp
+++ b/include/network/network_io.hpp
@@ -39,6 +39,7 @@ private :
 	void deinit(); // will be called for each instance when the app exits
 public :
 	CURL* curl = NULL;
+	char *curl_errbuf;
 	// should not be used from outside network_io.cpp
 	std::map<std::string, NetworkSession> sessions; 
 	std::vector<u8> *buffer;
diff --git a/source/network/network_downloader.cpp b/source/network/network_downloader.cpp
index 36479bc6..5cc1c412 100644
--- a/source/network/network_downloader.cpp
+++ b/source/network/network_downloader.cpp
@@ -268,10 +268,13 @@ void NetworkStreamDownloader::downloader_thread() {
 				}
 				if (cur_stream->ready && result.data.size() != expected_len) {
 					Util_log_save(LOG_THREAD_STR, "size discrepancy : " + std::to_string(expected_len) + " -> " + std::to_string(result.data.size()));
-					cur_stream->error = true;
+					if (cur_stream->retry_cnt_left) {
+						cur_stream->retry_cnt_left--;
+					} else cur_stream->error = true;
 					result.finalize();
 					continue;
 				}
+				cur_stream->retry_cnt_left = NetworkStream::RETRY_CNT_MAX;
 				cur_stream->set_data(block_reading, result.data);
 				cur_stream->ready = true;
 			} else {
diff --git a/source/network/network_io.cpp b/source/network/network_io.cpp
index fbec45a9..6041f3af 100644
--- a/source/network/network_io.cpp
+++ b/source/network/network_io.cpp
@@ -564,6 +564,8 @@ static NetworkResult access_http_internal(NetworkSessionList &session_list, cons
 			curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_receive_data_callback_func);
 			curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, curl_receive_headers_callback_func);
 			curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, curl_set_socket_options);
+			session_list.curl_errbuf = (char *) malloc(CURL_ERROR_SIZE);
+			curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, session_list.curl_errbuf);
 			// curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout);
 		}
 		curl_easy_setopt(curl, CURLOPT_WRITEDATA, &res.data);
@@ -587,7 +589,7 @@ static NetworkResult access_http_internal(NetworkSessionList &session_list, cons
 			curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &redirected_url);
 			res.redirected_url = redirected_url;
 			if (res.redirected_url != url) Util_log_save("curl", "redir : " + res.redirected_url);
-		} else Util_log_save("curl", "deep fail");
+		} else Util_log_save("curl", std::string("deep fail : ") + curl_easy_strerror(curl_code) + " / " + session_list.curl_errbuf);
 		
 		curl_slist_free_all(request_headers_list);
 	}