I have seen below log in vmware-converter-worker-9.log
onverter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
2018-01-24T09:51:58.207-05:00 error vmware-converter-worker[22564] [Originator@6876 sub=Ufa.HTTPService] Failed to read request; stream: <io_obj p:0x0631828c, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
2018-01-24T10:01:08.995-05:00 error vmware-converter-worker[22564] [Originator@6876 sub=Ufa.HTTPService] Failed to read request; stream: <io_obj p:0x0631852c, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
2018-01-24T10:10:34.918-05:00 error vmware-converter-worker[03632] [Originator@6876 sub=Ufa.HTTPService] Failed to read request; stream: <io_obj p:0x063184cc, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
2018-01-24T10:11:45.053-05:00 error vmware-converter-worker[05388] [Originator@6876 sub=Ufa.HTTPService] Failed to read request; stream: <io_obj p:0x06317c8c, h:-1, <pipe '\\.\pipe\vmware-converter-worker-soap'>, <pipe '\\.\pipe\vmware-converter-worker-soap'>>, error: class Vmacore::TimeoutException(Operation timed out)
This issue occurs when the Helper Virtual Machine deployed by vCenter Converter Standalone runs out of system memory before completing the conversion process.
Please find below KB for this issue