Network scan

Network scan

Hello,
I tried network scan on Ubuntu in my lab, opened port for telnet and ssh in Ubuntu and both time failed. I tested telnet from cmd and it worked, but in SDP I get: Problem while discovering the workstation. Scanning with ssh protocol I get: Connection to RPC server in the workstation failed. SDP version is 8.0.0 Build 8004. Where could be the problem?
Regards


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