diff --git a/Dockerfile b/Dockerfile
index faf4e44..1778bd1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ RUN mkdir out && \
     ninja
 
 FROM fedora:29
-RUN dnf install -y glib2 tor
+RUN dnf install -y glib2 tor valgrind
 WORKDIR /home/donar
 RUN mkdir /home/donar/shared && mkdir /home/donar/res && chown -R 1000 /home/donar
 USER 1000
diff --git a/README.md b/README.md
index 03cac15..8a1a74e 100644
--- a/README.md
+++ b/README.md
@@ -25,14 +25,22 @@ mkdir -p ./{xp1-shared,xp1-res}
 sudo chown -R 1000 ./{xp1-shared,xp1-res}
 
 sudo docker run -t -i \
+  --privileged \
   -v `pwd`/xp1-shared:/home/donar/shared \
   registry.gitlab.inria.fr/qdufour/donar \
   xp1-server
  
 sudo docker run -t -i \
+  --privileged \
   -v `pwd`/xp1-res:/home/donar/res \
   -v `pwd`/xp1-shared:/home/donar/shared \
   registry.gitlab.inria.fr/qdufour/donar \
   xp1-client 1000 100 100
 
 ```
+
+## Run an XP instance
+
+```
+sudo ./scripts/xp1 1000 100 100
+```
diff --git a/scripts/xp1 b/scripts/xp1
new file mode 100755
index 0000000..78945d4
--- /dev/null
+++ b/scripts/xp1
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Create workdir
+XP_FOLDER=`mktemp -d -p . xp1-XXXXXXXXXXXXXXXX`
+mkdir -p $XP_FOLDER
+cd $XP_FOLDER
+
+# Create folders
+mkdir -p ./{shared,log,res}
+chown -R 1000 ./{shared,log,res}
+
+# Run server
+docker run \
+  --privileged \
+  --rm \
+  -v `pwd`/shared:/home/donar/shared \
+  -v `pwd`/log:/home/donar/log \
+  registry.gitlab.inria.fr/qdufour/donar \
+  xp1-server &
+
+sleep 30
+
+# Run client
+docker run \
+  --privileged \
+  --rm \
+  -v `pwd`/res:/home/donar/res \
+  -v `pwd`/shared:/home/donar/shared \
+  -v `pwd`/log:/home/donar/log \
+  registry.gitlab.inria.fr/qdufour/donar \
+  xp1-client $1 $2 $3
+
+# Kill server
+kill %1
diff --git a/scripts/xp1-client b/scripts/xp1-client
index 33c60b8..df0bcad 100755
--- a/scripts/xp1-client
+++ b/scripts/xp1-client
@@ -1,7 +1,9 @@
 #!/bin/bash
-tor -f /etc/torrc &
+mkdir -p ./log
+tor -f /etc/torrc > ./log/client-tor-stdout.log 2> ./log/client-tor-stderr.log &
 sleep 2
 mkdir -p ./shared
-donar -a naive -c -o ./shared/onion_services.pub -r 9000 &
-measlat -h 127.13.3.7 -p 9000 # Used to wait for connections
-measlat -h 127.13.3.7 -p 9000 -c $1 -i $2 -s $3 > `mktemp -p ./res res-XXXXXXXXXXXXXXXX.txt`
+valgrind donar -a naive -c -o ./shared/onion_services.pub -r 9000 > ./log/client-donar-stdout.log 2> ./log/client-donar-stderr.log &
+sleep 2
+measlat -h 127.13.3.7 -p 9000 > /dev/null 2>&1 # Used to wait for connections
+measlat -h 127.13.3.7 -p 9000 -c $1 -i $2 -s $3 > `mktemp -p ./res res-XXXXXXXXXXXXXXXX.txt` 2> ./log/client-measlat-stderr.log
diff --git a/scripts/xp1-server b/scripts/xp1-server
index 1cfc4d9..a5a16d1 100755
--- a/scripts/xp1-server
+++ b/scripts/xp1-server
@@ -1,8 +1,9 @@
 #!/bin/bash
-tor -f /etc/torrc &
+mkdir -p ./log
+tor -f /etc/torrc > ./log/server-tor-stdout.log 2> ./log/server-tor-stderr.log  &
 sleep 2
 mkdir -p ./shared
 cd ./shared
 pwd
-donar -a naive -s -e 9000 &
-udpecho -p 9000
+valgrind donar -a naive -s -e 9000 > ../log/server-donar-stdout.log 2> ../log/server-donar-stderr.log &
+udpecho -p 9000 > ../log/server-udpecho-stdout.log 2> ../log/server-udpecho-stderr.log
diff --git a/src/donar.c b/src/donar.c
index 825977d..e098bdc 100644
--- a/src/donar.c
+++ b/src/donar.c
@@ -13,6 +13,7 @@ void free_port (void* ptr) {
 }
 
 int main(int argc, char** argv) {
+    setvbuf(stdout, NULL, _IONBF, 0);
     printf("~ Donar ~\n");
 
     int opt, is_server, is_client, errored;
diff --git a/src/donar_client.c b/src/donar_client.c
index 9b1df78..2a0bd21 100644
--- a/src/donar_client.c
+++ b/src/donar_client.c
@@ -67,13 +67,20 @@ int configure_tcp_clients(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdin
     case SOCKS5_STATE_ACK:
       //@FIXME: We suppose that we will be able to do the whole read at once which is wrong too
       err = socks5_reply (fdinfo->fd);
-      fprintf(stderr, "captured err: %d\n", err);
-      if (err < 0) goto on_socks5_err;
+      if (err == -SOCKS5_REP_GENERAL_FAILURE || err == -SOCKS5_REP_TTLEXP || err == -SOCKS5_REP_HOSTUNREACH) {
+        fprintf(stderr, "%s is not ready, received %s\n", fdinfo->url, socks5_rep(-err));
+        goto on_socks5_err;
+      } else if (err < 0) {
+        fprintf(stderr, "An other error occured on %s\n", fdinfo->url);
+        exit(EXIT_FAILURE);
+      }
       app_ctx->client_sock[pos].state = SOCKS5_STATE_RDY;
       int sock1, sock2;
       sock1 = dup(fdinfo->fd);
       sock2 = dup(fdinfo->fd);
-      if (sock1 < 0 || sock2 < 0) goto on_socks5_err;
+      if (sock1 < 0 || sock2 < 0) {
+        exit(EXIT_FAILURE);
+      }
       void* fdcat = evt_core_rm_fd (ctx, fdinfo->fd);
       if (fdcat == NULL) {
         exit(EXIT_FAILURE);
@@ -107,10 +114,9 @@ int configure_tcp_clients(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdin
 
     return 1;
 on_socks5_err:
-    perror("An error occured while connecting to an Onion Service");
+    //perror("An error occured while connecting to an Onion Service");
     app_ctx->client_sock[pos].state = SOCKS5_STATE_ERR;
     evt_core_rm_fd (ctx, fdinfo->fd);
-    perror("0");
     sleep(2);
     init_tcp_client (app_ctx, pos);
     return 1;
diff --git a/src/evt_core.c b/src/evt_core.c
index 4ef18af..7e3ee92 100644
--- a/src/evt_core.c
+++ b/src/evt_core.c
@@ -178,7 +178,7 @@ void evt_core_loop(struct evt_core_ctx* ctx) {
         if (fdinfo != NULL) {
           if (fdinfo->cat->err_cb != NULL) {
             if (fdinfo->cat->err_cb(ctx, fdinfo) == 1) {
-              fprintf(stderr, "fd=%d on cat=%s is handled by app\n", err_fd, fdinfo->cat->name);
+              fprintf(stderr, "Error on fd=%d on cat=%s is handled by app, not clearing it\n", err_fd, fdinfo->cat->name);
               continue;
             }
           }
diff --git a/src/socks5.c b/src/socks5.c
index 2e450e1..a519965 100644
--- a/src/socks5.c
+++ b/src/socks5.c
@@ -104,3 +104,7 @@ int socks5_connect_dns(int sock, char* addr, uint16_t port) {
     }
     return 0;
 }
+
+char* socks5_rep (enum socks5_rep rep) {
+  return rep_msg[rep];
+}
diff --git a/src/socks5.h b/src/socks5.h
index c56acb6..742f663 100644
--- a/src/socks5.h
+++ b/src/socks5.h
@@ -36,6 +36,18 @@ union socks5_addr {
     uint8_t ipv6[16];
 };
 
+enum socks5_rep {
+  SOCKS5_REP_SUCCESS,
+  SOCKS5_REP_GENERAL_FAILURE,
+  SOCKS5_REP_CONOTALLOWED,
+  SOCKS5_REP_NETUNREACH,
+  SOCKS5_REP_HOSTUNREACH,
+  SOCKS5_REP_COREFUSED,
+  SOCKS5_REP_TTLEXP,
+  SOCKS5_REP_CMDNOTSUP,
+  SOCKS5_REP_ADDRNOTSUP
+};
+
 static char* rep_msg[] = {
   "Succeeded",
   "General SOCKS server failure",
@@ -87,3 +99,4 @@ int socks5_handshake_syn(int sock);
 int socks5_handshake_ack(int sock);
 int socks5_connect_dns(int sock, char* addr, uint16_t port);
 int socks5_reply(int sock);
+char* socks5_rep (enum socks5_rep rep);