diff --git a/src/udprelay.c b/src/udprelay.c
index b6184038..7d4d2d5b 100644
--- a/src/udprelay.c
+++ b/src/udprelay.c
@@ -493,7 +493,7 @@ static void remote_recv_cb (EV_P_ ev_io *w, int revents)
     buf = ss_encrypt_all(BUF_SIZE, buf, &buf_len, server_ctx->method);
 #endif
 
-    int s = sendto(remote_ctx->fd, buf, buf_len, 0, &remote_ctx->src_addr, sizeof(remote_ctx->src_addr));
+    int s = sendto(server_ctx->fd, buf, buf_len, 0, &remote_ctx->src_addr, sizeof(remote_ctx->src_addr));
 
     if (s == -1)
     {
@@ -681,8 +681,8 @@ static void server_recv_cb (EV_P_ ev_io *w, int revents)
 
 #else
 
-    buf_len -= offset;
-    memmove(buf, buf + offset, buf_len);
+    buf_len -= (offset + addr_header_len);
+    memmove(buf, buf + (offset + addr_header_len), buf_len);
 
     if (remote_ctx == NULL)
     {
@@ -701,7 +701,7 @@ static void server_recv_cb (EV_P_ ev_io *w, int revents)
             goto CLEAN_UP;
         }
 
-        struct query_ctx *query_ctx = new_query_ctx(query, buf + addr_header_len, buf_len - addr_header_len);
+        struct query_ctx *query_ctx = new_query_ctx(query, buf, buf_len);
         query_ctx->server_ctx = server_ctx;
         query_ctx->addr_header_len = addr_header_len;
         query_ctx->src_addr = src_addr;
@@ -713,7 +713,7 @@ static void server_recv_cb (EV_P_ ev_io *w, int revents)
     else
     {
 
-        int s = sendto(remote_ctx->fd, buf + addr_header_len, buf_len - addr_header_len, 0, &remote_ctx->dst_addr, sizeof(remote_ctx->dst_addr));
+        int s = sendto(remote_ctx->fd, buf, buf_len, 0, &remote_ctx->dst_addr, sizeof(remote_ctx->dst_addr));
 
         if (s == -1)
         {