@dimosthenis20
Sorry for not responding earlier, for some reason I didn’t get a notification about your response. Next time ping me when you respond 
What are you trying to achieve? The txAdmin is a web application if I am not mistaken (source) SRV doesn’t work on web-based panels if I’m correct. You will need to host the panel on 80 or 443 (preferred) if you want to connect to it without a port number. Read more about how SRV doesn’t work for HTTP/HTTPS domain name system - SRV record to serve a webpage at a specific IP/Port - Server Fault