Psexec.exe not communicating with credentials

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http://serverfault.com – I am Sreehari. I am using psexec.exe to excute command on remote computers. I am able to run commands on remote computers without credentials. If I provide credentials Psexec not communicating. Please help Example. Psexec.exe \remoteomputername Ipconfig (Working) Psexec.exe -u domainname\username -p password \remotecomputername ipconfig (not working) Please someone help (HowTos)