WinRM - the specified credentials were rejected by the server

I am unable to get WinRM session in a python script.

Environment

ad-dns.test.com    - Windows 2012 AD and DNS Server
box88.test.com     - CentOS 7.2 : Kerberos, Python (Not joined to domain)
box62.test.com     - Windows 2012 R2 Standard (Joined to domain)
box63.test.com     - Windows 10 (Joined to domain)

---

Configurations

I have enabled WinRM on Windows 10 and 2012 server through ConfigureRemotingForAnsible.ps1 PowerShell script. These are the WinRM configurations.

PS C:\Windows\system32> winrm get winrm/config
Config
    MaxEnvelopeSizekb = 500
    MaxTimeoutms = 60000
    MaxBatchItems = 32000
    MaxProviderRequests = 4294967295
    Client
        NetworkDelayms = 5000
        URLPrefix = wsman
        AllowUnencrypted = false
        Auth
            Basic = true
            Digest = true
            Kerberos = true
            Negotiate = true
            Certificate = true
            CredSSP = false
        DefaultPorts
            HTTP = 5985
            HTTPS = 5986
        TrustedHosts = *
    Service
        RootSDDL = O:NSG:BAD:P(A;;GA;;;BA)(A;;GR;;;IU)S:P(AU;FA;GA;;;WD)(AU;SA;GXGW;;;WD)
        MaxConcurrentOperations = 4294967295
        MaxConcurrentOperationsPerUser = 1500
        EnumerationTimeoutms = 240000
        MaxConnections = 300
        MaxPacketRetrievalTimeSeconds = 120
        AllowUnencrypted = false
        Auth
            Basic = true
            Kerberos = true
            Negotiate = true
            Certificate = false
            CredSSP = false
            CbtHardeningLevel = Relaxed
        DefaultPorts
            HTTP = 5985
            HTTPS = 5986
        IPv4Filter = *
        IPv6Filter = *
        EnableCompatibilityHttpListener = false
        EnableCompatibilityHttpsListener = false
        CertificateThumbprint
        AllowRemoteAccess = true
    Winrs
        AllowRemoteShellAccess = true
        IdleTimeout = 7200000
        MaxConcurrentUsers = 10
        MaxShellRunTime = 2147483647
        MaxProcessesPerShell = 25
        MaxMemoryPerShellMB = 1024
        MaxShellsPerUser = 30
PS C:\Windows\system32> 

I have prepared CentOS box as below

# yum -y install python-pip python-devel krb5-devel krb5-libs krb5-workstation
# pip install --upgrade pip
# pip install  "pywinrm>=0.1.1" kerberos pykerberos requests-kerberos isodate xmltodict

# cat /etc/krb5.conf
[libdefaults]
 default_realm = TEST.COM

[realms]
 TEST.COM = {
  kdc = ad-dns.test.com
  admin_server   = ad-dns.test.com
  kpasswd_server = ad-dns.test.com
  default_domain = test.com
 }

[domain_realm]
 .test.com = TEST.COM
 test.com = TEST.COM
#

# kinit [e-mail]
Password for [e-mail]:
# klist
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: [e-mail]

Valid starting       Expires              Service principal
2016-06-30T02:15:20  2016-06-30T12:15:20  krbtgt/[e-mail]
    renew until 2016-07-01T02:15:16
#

Problem

Until now, everything appears smooth. The problem occurs when I try to use this kerberos ticket to authenticate the Windows servers using the below script.

#!/usr/bin/env python

import winrm

s = winrm.Session('box63.test.com', auth=('[e-mail]', 'IamUsingKerbTicket'), transport='kerberos')
r = s.run_cmd('ipconfig', ['/all'])
print r.status_code
print r.std_out
print r.std_err


# ./winrm_ipconfig.py
Traceback (most recent call last):
  File "./winrm_ipconfig.py", line 6, in <module>
    r = s.run_cmd('ipconfig', ['/all'])
  File "/usr/lib/python2.7/site-packages/winrm/__init__.py", line 37, in run_cmd
    shell_id = self.protocol.open_shell()
  File "/usr/lib/python2.7/site-packages/winrm/protocol.py", line 132, in open_shell
    res = self.send_message(xmltodict.unparse(req))
  File "/usr/lib/python2.7/site-packages/winrm/protocol.py", line 207, in send_message
    return self.transport.send_message(message)
  File "/usr/lib/python2.7/site-packages/winrm/transport.py", line 179, in send_message
    raise InvalidCredentialsError("the specified credentials were rejected by the server")
winrm.exceptions.InvalidCredentialsError: the specified credentials were rejected by the server
#

Not sure, why I see this error while Event Logs on Windows server show success. Apparently, I see three Logon and Logoff occurring at the same time.

Not sure what I am missing here. Firewall is stopped/disabled on both CentOS & Windows machines and times are also in sync.

[atul-ram]

netsh advfirewall firewall add rule name=“WinRM-HTTP” dir=in localport=5985 protocol=TCP action=allow

this worked for me.

[deepd]

I came across this same issue even with “AllowUnencrypted” set to true. I observed that win_ping was working for a user (IEUser) that was added to Administrator group and failing with windows-server | UNREACHABLE! => { "changed": false, "msg": "plaintext: the specified credentials were rejected by the server", "unreachable": true } for a user (test-user) that was not in Administrator group.

So I added the test-user to Administrator group and the issue got resolved.