diff --git a/src/openvpn/networking_sitnl.c b/src/openvpn/networking_sitnl.c
index b2f3ac72..29b7d8c2 100644
--- a/src/openvpn/networking_sitnl.c
+++ b/src/openvpn/networking_sitnl.c
@@ -660,7 +660,7 @@ net_iface_up(openvpn_net_ctx_t *ctx, const char *iface, bool up)
     {
         msg(M_WARN, "%s: rtnl: cannot get ifindex for %s: %s", __func__, iface,
             strerror(errno));
-        return -ENOENT;
+        return -errno;
     }
 
     req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.i));
@@ -698,7 +698,7 @@ net_iface_mtu_set(openvpn_net_ctx_t *ctx, const char *iface,
     {
         msg(M_WARN | M_ERRNO, "%s: rtnl: cannot get ifindex for %s", __func__,
             iface);
-        return -1;
+        return -errno;
     }
 
     req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.i));
@@ -731,7 +731,7 @@ net_addr_ll_set(openvpn_net_ctx_t *ctx, const openvpn_net_iface_t *iface,
     {
         msg(M_WARN | M_ERRNO, "%s: rtnl: cannot get ifindex for %s", __func__,
             iface);
-        return -1;
+        return -errno;
     }
 
     req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.i));
@@ -839,7 +839,7 @@ sitnl_addr_ptp_add(sa_family_t af_family, const char *iface,
     {
         msg(M_WARN, "%s: cannot get ifindex for %s: %s", __func__, np(iface),
             strerror(errno));
-        return -ENOENT;
+        return -errno;
     }
 
     return sitnl_addr_set(RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, ifindex,
@@ -872,7 +872,7 @@ sitnl_addr_ptp_del(sa_family_t af_family, const char *iface,
     if (ifindex == 0)
     {
         msg(M_WARN | M_ERRNO, "%s: cannot get ifindex for %s", __func__, iface);
-        return -ENOENT;
+        return -errno;
     }
 
     return sitnl_addr_set(RTM_DELADDR, 0, ifindex, af_family, local, NULL, 0);
@@ -979,7 +979,7 @@ sitnl_addr_add(sa_family_t af_family, const char *iface,
     {
         msg(M_WARN | M_ERRNO, "%s: rtnl: cannot get ifindex for %s", __func__,
             iface);
-        return -ENOENT;
+        return -errno;
     }
 
     return sitnl_addr_set(RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, ifindex,
@@ -1013,7 +1013,7 @@ sitnl_addr_del(sa_family_t af_family, const char *iface, inet_address_t *addr,
     {
         msg(M_WARN | M_ERRNO, "%s: rtnl: cannot get ifindex for %s", __func__,
             iface);
-        return -ENOENT;
+        return -errno;
     }
 
     return sitnl_addr_set(RTM_DELADDR, 0, ifindex, af_family, addr, NULL,
@@ -1163,7 +1163,7 @@ sitnl_route_add(const char *iface, sa_family_t af_family, const void *dst,
         {
             msg(M_WARN | M_ERRNO, "%s: rtnl: can't get ifindex for %s",
                 __func__, iface);
-            return -ENOENT;
+            return -errno;
         }
     }
 
@@ -1256,7 +1256,7 @@ sitnl_route_del(const char *iface, sa_family_t af_family, inet_address_t *dst,
         {
             msg(M_WARN | M_ERRNO, "%s: rtnl: can't get ifindex for %s",
                 __func__, iface);
-            return -ENOENT;
+            return -errno;
         }
     }
 
@@ -1483,7 +1483,7 @@ net_iface_del(openvpn_net_ctx_t *ctx, const char *iface)
 
     if (!ifindex)
     {
-        return errno;
+        return -errno;
     }
 
     req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.i));