FBRemoteEvent crashes app

I am having fb remote event with which I listen to database and I start it with my app load inside thread.

When I run it on my Windows 10 (local pc) it works normally and perfect BUT when I run it on Windows Server 2003 it start filling RAM Memory a lot more than it should and when it reach server limit it just closes.

Here is my code:

private void DataBaseEventListner()
{
    FbRemoteEvent revent = new FbRemoteEvent(M.Baza.connectionString);
    FbRemoteEvent revent1 = new FbRemoteEvent(M.Baza.connectionKomercijalno2018);

    revent.RemoteEventCounts += (sender, e) =>
    {
        this.Invoke(new MethodInvoker(delegate
        {
            Poruka p = new Poruka(Magacin.Poruka.UcitajPoslednjuPorukuID(Korisnik.korisnikId));
            p.Show();
        }));
    };

    revent1.RemoteEventCounts += (sender, e) =>
    {
        switch (e.Name)
        {
            case "PP_NEW":
            case "PP_UPD":
                Thread thread1 = new Thread(UcitajPoslovnePartnere);
                thread1.Start();
                break;
        }
    };

    revent.QueueEvents(String.Format("nova_poruka~" + Korisnik.korisnikId.ToString()));
    revent1.QueueEvents(new string[] { "PP_NEW", "PP_UPD" });
}


private void UcitajPoslovnePartnere()
{
    poslovniPartneri = Komercijalno.Partner.Lista();
}

public static List<Int_String> Lista()
{
    List<Int_String> list = new List<Int_String>();
    using (FbConnection con = new FbConnection(M.Baza.connectionKomercijalno2018))
    {
        con.Open();
        using (FbCommand cmd = new FbCommand("SELECT PPID, NAZIV FROM PARTNER ORDER BY NAZIV", con))
        {
            FbDataReader dr = cmd.ExecuteReader();
            list.Add(new Int_String { _int = -1, _string = "<izaberi partnera>" });
            while (dr.Read())
                list.Add(new Int_String { _int = Convert.ToInt32(dr[0]), _string = dr[1].ToString() });
        }
        con.Close();
    }
    return list;
}

I wrapped this in a try-catch and the error I get is:

Error reading data from the connection.
at FirebirdSql.Data.FirebirdClient.FbRemoteEvent.QueueEvents(String[] events)
at Magacin.Main.DataBaseEventListner()

In firebird log I get

TERMINAL_64 (Server)    Sat Jun 30 17:03:52 2018
INET/inet_error: read errno = 10054

I tried setting Pooling=false but still not working

I am loading my connection string from .TXT and when i am loading it i am building it like this:

string[] data = line.Split('|');
//Here I do something with data[0] which is not part of connection string
Baza.connectionString = System.String.Format(@"data source={3};initial catalog = {0};user={1};password={2}", data[1], data[2], data[3], data[4]);

String inside my .TXT file is:

C:\Prirucni Magacin\PRIRUCNIMAGACIN.FDB|SYSDBA|masterkey|localhost //This is on local pc

so final string looks like:

data source=localhost;initial catalog = C:\Prirucni Magacin\PRIRUCNIMAGACIN.FDB;user=SYSDBA;password=masterkey

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