Any network device can block rpc protocol?

Hi.

I am not good at networking. I come here because I meet issue. I am windows sysadmin. My windows servers and my windows clients have "rpc failed". For testing, whole of computers with windows has no firewall. So rpc protocol should doing the job. Unfortunately, not. So I asking myself. Is there any network device can block rpc protocol? Spanning tree can block rpc protocol? I am hopeless because the network sysadmin says windows is bullshit so it's my own problem. On windows rpc protocol doesn't use only port 138, it uses randomly any port from 1000 to 65535.