Enet Multiplayer Game not connecting over the internet

Question

I am trying to make a multiplayer 2d shooter game using Enet. I wanted to test its networking capabilities with a friend. It uses a hybrid p2p and p2c architecture (A player can host a game, kinda like LAN worlds in minecraft, if you know what I mean). He gave me his IP and I tried to join his hosted game but my client couldn't connect.

I tried looking at how assault cube does its networking, but I found no answer.

This is how I connect:

bool connectToServer(ENetHost *&client, ENetPeer *&server, int32_t &cid, std::string ip, char *playerName)
{
    ENetAddress adress;
    ENetEvent event;

    if (ip.empty())
    {
        enet_address_set_host(&adress, "127.0.0.1");
    }
    else
    {
        enet_address_set_host(&adress, ip.c_str());
    }
    //enet_address_set_host(&adress, "95.76.249.14");
    //enet_address_set_host(&adress, "192.168.1.11");
    adress.port = 7778;

    //client, adress, channels, data to send rightAway
    server = enet_host_connect(client, &adress, SERVER_CHANNELS, 0);

    if (server == nullptr)
    {
        return false;
    }

    //see if we got events by server
    //client, event, ms to wait(0 means that we don't wait)
    if (enet_host_service(client, &event, 5000) > 0
        && event.type == ENET_EVENT_TYPE_CONNECT)
    {
        std::cout << "connected\n";
    }
    else
    {
        enet_peer_reset(server);
        return false;
    }


    if (enet_host_service(client, &event, 5000) > 0
        && event.type == ENET_EVENT_TYPE_RECEIVE)
    {
        Packet p = {};
        size_t size;
        auto data = parsePacket(event, p, size);
                // Handshake
        if (p.header != headerReceiveCIDAndData)
        {
            enet_peer_reset(server);
            return false;
        }

        cid = p.cid;

        glm::vec3 color = *(glm::vec3 *)data;
        auto e = phisics::Entity();
        e.pos = getSpawnPosition();
        e.lastPos = e.pos;
        e.color = color;
        memcpy(e.name, playerName, playerNameSize);
        players[cid] = e;

        sendPlayerData(e, true);

        std::cout << "received cid: " << cid << "\n";
        enet_packet_destroy(event.packet);
        return true;
    }
    else
    {
        enet_peer_reset(server);
        return 0;
    }

    return true;
}