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vCenter reports the warning "Registration/unregistration of third-party IO filter storage provider fails on a host."IO Filter are not shown within vCenter Storage Providers.In /var/log/iofiltervpd.log, you see error similar to: 2017-11-29T15:54:06Z iofiltervpd[67088]: IOFilterVPControlHandleMessage:239:received command: addconf /usr/lib/vmware/vmiof/disk/vmwarevmcrypt-config.xml VMW_vmwarevmcrypt_1.0.02017-11-29T15:54:06Z iofiltervpd[67088]: ReadConfigFromFile:247:/usr/lib/vmware/vmiof/disk/vmwarevmcrypt-config.xml: successfully loaded filter configuration.2017-11-29T15:54:06Z iofiltervpd[67088]: ReadConfigFromFile:248:FilterName: vmwarevmcrypt2017-11-29T15:54:06Z iofiltervpd[67088]: ReadConfigFromFile:249:FilterClass: encryption2017-11-29T15:54:06Z iofiltervpd[67088]: ReadConfigFromFile:250:FilterVersion: 1.0.02017-11-29T15:54:06Z iofiltervpd[67088]: ReadConfigFromFile:251:FilterType: disk2017-11-29T15:54:06Z iofiltervpd[67088]: LoadFilterCatalogs:191:Added 1 catalog(s) for filter vmwarevmcrypt2017-11-29T15:54:06Z iofiltervpd[67088]: LoadConfiguration:158:Added configuration file: /usr/lib/vmware/vmiof/disk/vmwarevmcrypt-config.xml successfully.2017-11-29T15:54:06Z iofiltervpd[67088]: AddConfiguration:258:Number of filters loaded: 12017-11-29T15:54:16Z iofiltervpd[67088]: IOFilterVPControlHandleMessage:239:received command: addconf /usr/lib/vmware/vmiof/disk/spm-config.xml VMW_spm_1.0.02017-11-29T15:54:16Z iofiltervpd[67088]: ReadConfigFromFile:247:/usr/lib/vmware/vmiof/disk/spm-config.xml: successfully loaded filter configuration.2017-11-29T15:54:16Z iofiltervpd[67088]: ReadConfigFromFile:248:FilterName: spm2017-11-29T15:54:16Z iofiltervpd[67088]: ReadConfigFromFile:249:FilterClass: datastoreIoControl2017-11-29T15:54:16Z iofiltervpd[67088]: ReadConfigFromFile:250:FilterVersion: 1.0.2302017-11-29T15:54:16Z iofiltervpd[67088]: ReadConfigFromFile:251:FilterType: disk2017-11-29T15:54:16Z iofiltervpd[67088]: LoadFilterCatalogs:191:Added 8 catalog(s) for filter spm2017-11-29T15:54:16Z iofiltervpd[67088]: LoadConfiguration:158:Added configuration file: /usr/lib/vmware/vmiof/disk/spm-config.xml successfully.2017-11-29T15:54:16Z iofiltervpd[67088]: AddConfiguration:258:Number of filters loaded: 22017-11-29T15:55:23Z iofiltervpd[67088]: run:159:SSL Connection error 30 : SSL_ERROR_SSL error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknownNote :This can also be found in /var/run/log/ in the log bundle, as iofiltervpd.log is not present in /var/logNote: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.
The IO Filter on the ESXi host is not correctly registered with the Host Certificate.
To resolve this issue - Refresh the IO Filter Registration on the ESXi Host SSH to ESXI hostBefore refreshing the IO filter registration - Verify the Host Certificate and Certificate chain is ok on the ESXi - these are located at the following locations: /etc/vmware/ssl/rui.crt/etc/vmware/ssl/castore.pem Manually refresh the certificates in the iofiltervp by running the following command: /usr/lib/vmware/iofilter/bin/iofvp-ctrl-app -r Rescan the Storage Providers in vCenter.