After an upgrade to Data Protector 9.05, the SAN transport mode falls back to LAN on the vSphere versions 5.1 and 5.5.
This caused by an issue in on the VMware side, a workaround is documented on http://kb.vmware.com/kb/2135621
Conclusion: Use ESXi 6.0 hosts.
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(DP) Support Tip: After an upgrade to DP 9.05, VMware backups are done via LAN instead of SAN
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