my sv 1.17 is runing perfect on 5000.
Try this:
1. Pach your game to 5000;
2. Go at control panel, time and date and change your date to january;
3. Go in your co2 folder and find your version.dat file and open it whit notepad, dont change any thing just save it;
4. Then find server.dat fille and do the same;
5. Now go in control panel and change your date;
i hope it will work 4 all of u
P.S. Sry 4 my english