diff --git a/src/connection_pool.c b/src/connection_pool.c
index 5471572..dea9463 100644
--- a/src/connection_pool.c
+++ b/src/connection_pool.c
@@ -221,11 +221,12 @@ int conn_pool_connect_server_ex1(ConnectionInfo *conn,
 	{
         if (log_connect_error)
         {
+            FC_FORMAT_IP_ADDRESS(conn->ip_addr, new_ip_addr);
             logError("file: "__FILE__", line: %d, "
                     "connect to %s%sserver %s:%u fail, errno: %d, "
                     "error info: %s", __LINE__, service_name != NULL ?
                     service_name : "", service_name != NULL ?  " " : "",
-                    conn->ip_addr, conn->port, result, STRERROR(result));
+                    new_ip_addr, conn->port, result, STRERROR(result));
         }
 
 		close(conn->sock);
@@ -255,9 +256,10 @@ int conn_pool_async_connect_server_ex(ConnectionInfo *conn,
     result = asyncconnectserverbyip(conn->sock, conn->ip_addr, conn->port);
     if (!(result == 0 || result == EINPROGRESS))
     {
+        FC_FORMAT_IP_ADDRESS(conn->ip_addr, new_ip_addr);
         logError("file: "__FILE__", line: %d, "
                 "connect to server %s:%u fail, errno: %d, "
-                "error info: %s", __LINE__, conn->ip_addr,
+                "error info: %s", __LINE__, new_ip_addr,
                 conn->port, result, STRERROR(result));
         close(conn->sock);
         conn->sock = -1;
@@ -319,12 +321,13 @@ static ConnectionInfo *get_connection(ConnectionPool *cp,
 			if ((cp->max_count_per_entry > 0) && 
 				(cm->total_count >= cp->max_count_per_entry))
 			{
+                FC_FORMAT_IP_ADDRESS(conn->ip_addr, new_ip_addr);
 				*err_no = ENOSPC;
 				logError("file: "__FILE__", line: %d, "
 					"connections: %d of %s%sserver %s:%u exceed limit: %d",
                     __LINE__, cm->total_count, service_name != NULL ?
                     service_name : "", service_name != NULL ? " " : "",
-                    conn->ip_addr, conn->port, cp->max_count_per_entry);
+                    new_ip_addr, conn->port, cp->max_count_per_entry);
 				pthread_mutex_unlock(&cm->lock);
 				return NULL;
 			}
@@ -529,18 +532,20 @@ static int close_connection(ConnectionPool *cp, ConnectionInfo *conn,
 	pthread_mutex_unlock(&cp->lock);
 	if (cm == NULL)
 	{
-		logError("file: "__FILE__", line: %d, " \
-			"hash entry of server %s:%u not exist", __LINE__, \
-			conn->ip_addr, conn->port);
+        FC_FORMAT_IP_ADDRESS(conn->ip_addr, new_ip_addr);
+		logError("file: "__FILE__", line: %d, "
+			"hash entry of server %s:%u not exist",
+            __LINE__, new_ip_addr, conn->port);
 		return ENOENT;
 	}
 
 	node = (ConnectionNode *)((char *)conn - sizeof(ConnectionNode));
 	if (node->manager != cm)
 	{
-		logError("file: "__FILE__", line: %d, " \
-			"manager of server entry %s:%u is invalid!", \
-			__LINE__, conn->ip_addr, conn->port);
+        FC_FORMAT_IP_ADDRESS(conn->ip_addr, new_ip_addr);
+		logError("file: "__FILE__", line: %d, "
+			"manager of server entry %s:%u is invalid!",
+			__LINE__, new_ip_addr, conn->port);
 		return EINVAL;
 	}
 
diff --git a/src/sockopt.c b/src/sockopt.c
index 645c130..dd2676e 100644
--- a/src/sockopt.c
+++ b/src/sockopt.c
@@ -812,7 +812,7 @@ int setsockaddrbyip(const char *ip, const uint16_t port,
     if (is_ipv6_addr(ip))
     {
         convert->len = sizeof(convert->sa.addr6);
-        if (strchr(ip, '#') != NULL)
+        if (strchr(ip, '%') != NULL)
         {
             struct addrinfo hints, *res;
 
@@ -873,8 +873,8 @@ int connectserverbyip(int sock, const char *server_ip, const uint16_t server_por
 	return 0;
 }
 
-int connectserverbyip_nb_ex(int sock, const char *server_ip, \
-		const uint16_t server_port, const int timeout, \
+int connectserverbyip_nb_ex(int sock, const char *server_ip,
+		const uint16_t server_port, const int timeout,
 		const bool auto_detect)
 {
 	int result;
@@ -1069,10 +1069,11 @@ int socketClientEx2(int af, const char *server_ip,
             server_port, timeout, auto_detect);
     if (*err_no != 0)
     {
+        FC_FORMAT_IP_ADDRESS(server_ip, new_ip_addr);
         logError("file: "__FILE__", line: %d, "
                 "connect to %s:%u fail, "
                 "errno: %d, error info: %s",
-                __LINE__, server_ip, server_port,
+                __LINE__, new_ip_addr, server_port,
                 *err_no, STRERROR(*err_no));
         close(sock);
         return -4;
diff --git a/src/sockopt.h b/src/sockopt.h
index 32d3d7a..edc4d9c 100644
--- a/src/sockopt.h
+++ b/src/sockopt.h
@@ -52,6 +52,16 @@
 
 #define FAST_WRITE_BUFF_SIZE  (256 * 1024)
 
+#define FC_FORMAT_IP_ADDRESS(old_ip_addr, new_ip_addr)  \
+    char new_ip_addr[IP_ADDRESS_SIZE + 2]; \
+    do {  \
+        if (is_ipv6_addr(old_ip_addr)) { \
+            sprintf(new_ip_addr, "[%s]", old_ip_addr); \
+        } else { \
+            strcpy(new_ip_addr, old_ip_addr); \
+        } \
+    } while (0)
+
 typedef struct fast_if_config {
     char name[IF_NAMESIZE];    //if name
     char mac[64];