Error: Parsing of section winperf_if_get_netadapter failed

mmartin · December 14, 2025, 9:31pm

CMK version: 2.4.0p17 CEE
OS version: Appliance 1.7.12

Error message: [agent] Success, [piggyback] Successfully processed from source ‘xxxvca01’, Parsing of section winperf_if_get_netadapter failedWARN, execution time 3.6 sec

Output of “cmk --debug -vvn hostname”:

OMD[prod]:~$ cmk --debug -vvn xxxfs001
value store: loading from disk
Checkmk version 2.4.0p17

FETCHING DATA
Source: SourceInfo(hostname=‘xxfs001’, ipaddress=‘10.xx.xx.xx’, ident=‘agent’, fetcher_type=<FetcherType.TCP: 8>, source_type=<SourceType.HOST: 1>)
[cpu_tracking] Start [7f9e64d94080]
Read from cache: AgentFileCache(path_template=/omd/sites/prod/tmp/check_mk/cache/xxxfs001, max_age=MaxAge(checking=0, discovery=90.0, inventory=90.0), simulation=False, use_only_cache=False, file_cache_mode=6)
Not using cache (Too old. Age is 46 sec, allowed is 0 sec)
Connecting via TCP to 10.xx.xx.xx:6556 (5.0s timeout)
Detected transport protocol: TransportProtocol.TLS
Reading data from agent via TLS socket
Reading data from agent
Detected transport protocol: TransportProtocol.PLAIN
Closing TCP connection to 10.xx.xx.xx:6556
Write data to cache file /omd/sites/prod/tmp/check_mk/cache/xxxfs001
Trying to acquire lock on /omd/sites/prod/tmp/check_mk/cache/xxxfs001
Got lock on /omd/sites/prod/tmp/check_mk/cache/xxxfs001
Releasing lock on /omd/sites/prod/tmp/check_mk/cache/xxxfs001
Released lock on /omd/sites/prod/tmp/check_mk/cache/xxxfs001
[cpu_tracking] Stop [7f9e64d94080 - Snapshot(process=posix.times_result(user=0.029999999999999805, system=0.0, children_user=0.0, children_system=0.0, elapsed=3.4599999971687794))]
Source: SourceInfo(hostname=‘xxxfs001’, ipaddress=‘10.xx.xx.xx’, ident=‘piggyback’, fetcher_type=<FetcherType.PIGGYBACK: 4>, source_type=<SourceType.HOST: 1>)
[cpu_tracking] Start [7f9e65bbe060]
Read from cache: NoCache(path_template=/dev/null, max_age=MaxAge(checking=0.0, discovery=0.0, inventory=0.0), simulation=False, use_only_cache=False, file_cache_mode=1)
1 piggyback files for ‘xxxfs001’.
Read piggyback file ‘/omd/sites/prod/tmp/check_mk/piggyback/xxxfs001/xxxvca01’
0 piggyback files for ‘10.xx.xx.xx’.
Get piggybacked data
[cpu_tracking] Stop [7f9e65bbe060 - Snapshot(process=posix.times_result(user=0.010000000000000231, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.0))]
[cpu_tracking] Start [7f9e65a41130]

PARSE FETCHER RESULTS
<<<check_mk>>> / Transition NOOPParser → HostSectionParser
<<<cmk_agent_ctl_status:sep(0)>>> / Transition HostSectionParser → HostSectionParser
<<<wmi_cpuload:sep(124)>>> / Transition HostSectionParser → HostSectionParser
<<>> / Transition HostSectionParser → HostSectionParser
<<>> / Transition HostSectionParser → HostSectionParser
<<df:sep(9)>> / Transition HostSectionParser → HostSectionParser
<<fileinfo:sep(124)>> / Transition HostSectionParser → HostSectionParser
<<>> / Transition HostSectionParser → HostSectionParser
<<>> / Transition HostSectionParser → HostSectionParser
<<<winperf_phydisk>>> / Transition HostSectionParser → HostSectionParser
<<<winperf_if>>> / Transition HostSectionParser → HostSectionParser
<<<winperf_processor>>> / Transition HostSectionParser → HostSectionParser
<<<dotnet_clrmemory:sep(124)>>> / Transition HostSectionParser → HostSectionParser
<<<wmi_webservices:sep(124)>>> / Transition HostSectionParser → HostSectionParser
<<ps:sep(9)>> / Transition HostSectionParser → HostSectionParser
Transition HostSectionParser → NOOPParser
<<<iis_app_pool_state:sep(124)>>> / Transition NOOPParser → HostSectionParser
<<<winperf_if_teaming:sep(9)>>> / Transition HostSectionParser → HostSectionParser
<<<winperf_if_get_netadapter:sep(124)>>> / Transition HostSectionParser → HostSectionParser
<<<cmk_update_agent_status:cached(1765744495,3600):sep(0)>>> / Transition HostSectionParser → HostSectionParser
Transition HostSectionParser → NOOPParser
<<>> / Transition NOOPParser → HostSectionParser
Using persisted section SectionName(‘win_cpuinfo’)
Using persisted section SectionName(‘win_os’)
Using persisted section SectionName(‘win_bios’)
Using persisted section SectionName(‘win_system’)
Using persisted section SectionName(‘win_computersystem’)
Using persisted section SectionName(‘win_computersystemproduct’)
Using persisted section SectionName(‘win_disks’)
Using persisted section SectionName(‘win_video’)
Using persisted section SectionName(‘win_networkadapter’)
Using persisted section SectionName(‘win_ip_r’)
Using persisted section SectionName(‘win_wmi_software’)
Using persisted section SectionName(‘win_wmi_updates’)
Using persisted section SectionName(‘win_reg_uninstall’)
Using persisted section SectionName(‘win_exefiles’)
<<<esx_vsphere_vm:cached(1765746107,90)>>> / Transition NOOPParser → HostSectionParser
<<<piggyback_source_summary:sep(0)>>> / Transition HostSectionParser → HostSectionParser
<<labels:sep(0)>> / Transition HostSectionParser → HostSectionParser
HostKey(hostname=‘xxxfs001’, source_type=<SourceType.HOST: 1>)  → Add sections: [‘check_mk’, ‘cmk_agent_ctl_status’, ‘cmk_update_agent_status’, ‘df’, ‘dotnet_clrmemory’, ‘fileinfo’, ‘iis_app_pool_state’, ‘logwatch’, ‘mem’, ‘ps’, ‘services’, ‘systemtime’, ‘uptime’, ‘win_bios’, ‘win_computersystem’, ‘win_computersystemproduct’, ‘win_cpuinfo’, ‘win_disks’, ‘win_exefiles’, ‘win_ip_r’, ‘win_networkadapter’, ‘win_os’, ‘win_reg_uninstall’, ‘win_system’, ‘win_video’, ‘win_wmi_software’, ‘win_wmi_updates’, ‘winperf_if’, ‘winperf_if_get_netadapter’, ‘winperf_if_teaming’, ‘winperf_phydisk’, ‘winperf_processor’, ‘wmi_cpuload’, ‘wmi_webservices’]
HostKey(hostname=‘xxxfs001’, source_type=<SourceType.HOST: 1>)  → Add sections: [‘esx_vsphere_vm’, ‘labels’, ‘piggyback_source_summary’]
Received no piggyback data
[cpu_tracking] Stop [7f9e65a41130 - Snapshot(process=posix.times_result(user=0.07999999999999963, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.08999999985098839))]
Trying to acquire lock on /omd/sites/prod/var/check_mk/crashes/base/3e2c4fb8-d930-11f0-9431-4e618eaae809/crash.info
Got lock on /omd/sites/prod/var/check_mk/crashes/base/3e2c4fb8-d930-11f0-9431-4e618eaae809/crash.info
Releasing lock on /omd/sites/prod/var/check_mk/crashes/base/3e2c4fb8-d930-11f0-9431-4e618eaae809/crash.info
Released lock on /omd/sites/prod/var/check_mk/crashes/base/3e2c4fb8-d930-11f0-9431-4e618eaae809/crash.info
Traceback (most recent call last):
File “/omd/sites/prod/bin/cmk”, line 157, in 
exit_status = modes.call(“–check”, None, opts, args, trace_context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/base/modes/init.py”, line 91, in call
return handler(*handler_args)
^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/base/modes/check_mk.py”, line 2356, in mode_check
error_handler,
^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/base/errorhandling/_handler.py”, line 66, in exit
*_handle_failure(
^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/base/errorhandling/_handler.py”, line 103, in _handle_failure
raise exc
File “/omd/sites/prod/lib/python3/cmk/base/modes/check_mk.py”, line 2374, in mode_check
checks_result = execute_checkmk_checks(
^^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/checkengine/checking/_checking.py”, line 84, in execute_checkmk_checks
service_results = list(
^^^^^
File “/omd/sites/prod/lib/python3/cmk/checkengine/checking/_checking.py”, line 219, in check_host_services
yield plugin.function(host_name, service, providers=providers)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/base/checkers.py”, line 566, in check_function
return get_aggregated_result(
^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/base/checkers.py”, line 891, in get_aggregated_result
section_kws, error_result = _get_monitoring_data_kwargs(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/base/checkers.py”, line 812, in _get_monitoring_data_kwargs
get_section_kwargs(
File “/omd/sites/prod/lib/python3/cmk/checkengine/sectionparserutils.py”, line 42, in get_section_kwargs
if (resolved := resolver.resolve(name)) is not None
^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/checkengine/sectionparser.py”, line 189, in resolve
parsing_result := self._parser.parse(producer_name, producer.parse_function)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/checkengine/sectionparser.py”, line 100, in parse
if (parsed := self._parse_raw_data(section_name, parse_function)) is None
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/checkengine/sectionparser.py”, line 121, in _parse_raw_data
return parse_function(list(raw_data))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “/omd/sites/prod/lib/python3/cmk/plugins/collection/agent_based/winperf_if.py”, line 379, in parse_winperf_if_get_netadapter
alias=line[1],
~~~~^^^
IndexError: list index out of range

Local Agent Output:

<<<win_exefiles:sep(124):persist(1765759545)>>>
<<<winperf_if_teaming:sep(9)>>>
<<<winperf_if_get_netadapter:sep(124)>>>
WAN Miniport (SSTP)|LAN-Verbindung* 1||2|Disconnected||{DDC76B7D-9201-4C0F-91B9-26D52FB9FCFC}
WAN Miniport (PPPOE)|LAN-Verbindung* 5||2|Disconnected||{C0EC1CF0-ABAD-43BB-88EF-EB99F379F828}
WAN Miniport (PPTP)|LAN-Verbindung* 4||2|Disconnected||{B8AD4519-B801-40DD-B963-40AA6B2C71C0}
WAN Miniport (GRE)|LAN-Verbindung* 6||2|Disconnected||{9E956E53-7FBD-49EF-91D9-42523F5C82C0}
|Teredo Tunneling Pseudo-Interface|0|6|Not Present||{93123211-9629-4E04-82F0-EA2E4F221468}
WAN Miniport (L2TP)|LAN-Verbindung* 3||2|Disconnected||{7BE588FD-9840-4E3A-A471-F404893548FC}
Microsoft Kernel Debug Network Adapter|Ethernet (Kerneldebugger)|0|6|Not Present||{7547B92D-0E7F-40F8-B3BA-F241AFC88AEB}
WAN Miniport (IKEv2)|LAN-Verbindung* 2||2|Disconnected||{72318B93-94EC-4D88-AE82-71A681F8C772}
vmxnet3 Ethernet Adapter|Ethernet0|10000000000|1|Up|00-50-56-B0-4F-D1|{55365416-0686-4B4D-AB05-7F44F334F634}
|Microsoft IP-HTTPS Platform Interface|0|6|Not Present||{2EE2C70C-A092-4D88-A654-98C8D7645CD5}
WAN Miniport (Network Monitor)|LAN-Verbindung* 9||1|Up||{21BDCC5E-3B51-444F-B06A-AA1A04D85895}
WAN Miniport (IPv6)|LAN-Verbindung* 8||1|Up||{1C3F4BF0-8DA6-411A-B5EF-0BA56AD2C7C4}
WAN Miniport (IP)|LAN-Verbindung* 7||1|Up||{1B6C84C1-D40E-41BD-A2D3-4FB30C7A4480}
|6to4 Adapter|0|6|Not Present||{07374750-E68B-490E-9330-9FD785CD71B6}
<<<windows_os_info:sep(44)>>>
Microsoft Windows Server 2019 Standard,N/A,00429-70000-00000-AA087
<<<>>>
<<<systemtime>>>
1765744856

I replaced agent 1.6.0p28 with 2.4.0p17. Since then, I have had several hosts with this error.
When I disable the piggiback data, the error remains.
What confuses me is the question mark in the box in the agent output, which I only see in the console. Could that be the reason, and where does it come from?

mmartin · December 14, 2025, 10:20pm

chatgpt suggests a change in winperf_if.py, which eliminates the error. It is due to the empty names of the adapters, which winperf_if.py cannot handle, but Microsoft apparently intends this.

~/lib/python3/cmk/plugins/collection/agent_based/winperf_if.py

def parse_winperf_if_get_netadapter(string_table: StringTable) -> SectionExtended:
    parsed = []

    for line in string_table:
        # Fallback für Alias: wenn line[1] fehlt oder leer, nimm line[0]
        alias = line[1] if len(line) > 1 and line[1] else line[0]

        speed_str = line[2] if len(line) > 2 else None
        speed = int(speed_str) if speed_str else 0

        oper_status = line[3] if len(line) > 3 else None
        oper_status_name = line[4] if len(line) > 4 else None
        mac_address = line[5].replace("-", ":") if len(line) > 5 and line[5] else None
        guid = line[6] if len(line) > 6 else None

        parsed.append(
            AdditionalIfData(
                name=_canonize_name(line[0]),
                alias=alias,
                speed=speed,
                oper_status=oper_status,
                oper_status_name=oper_status_name,
                mac_address=mac_address,
                guid=guid,
            )
        )

    return parsed

andreas-doehler · December 15, 2025, 4:56am

This output comes not from the windows_if.ps1 script. You should take a look at the script producing the “windows_os_info” section. There you have the real problem. With fixing this script you will have no error message at the interface check anymore.

mmartin · December 15, 2025, 11:06pm

Thanks a lot, Andreas, for the tip.
I assumed that everything would be replaced during the update agent installation. However, there were machines that still had an old plugin in the program data. Once that was removed, there were no more errors.