To resolve this issue we need to update the protocol in config.xml file.
- Take a backup of the config.xml file from this location "ProgramData/VMware/vCenterServer/cfg/vmsyslogcollector/config.xml"
- Inside the <defaultValues> stack, confirm the entry for the <protocol></protocol> tag is available with TCP/UDP as the default protocols.
<defaultValues>
<port>514</port>
<protocol>TCP,UDP</protocol>
<maxSize>10</maxSize>
<rotate>20</rotate>
<sslPort>1514</sslPort>
</defaultValues>
- Retry the vCenter Server upgrade process.