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RPC_S_NO_PROTSEQS
This is a protocol-sequence inventory failure
RPC_S_NO_PROTSEQS is associated with querying or selecting RPC protocol sequences. A protocol sequence identifies the RPC protocol, transport, and network protocol combination used by a binding. The runtime exposes APIs to enumerate sequences supported by both RPC and the operating system.
The status is different from RPC_S_NO_PROTSEQS_REGISTERED. The latter says a server has not registered transports for listening; RPC_S_NO_PROTSEQS says no protocol sequences are available from the relevant query or selection.
What to inspect
- Record the operating system and RPC runtime environment rather than hard-coding a transport copied from another platform.
- Use
RpcNetworkIsProtseqValidorRpcNetworkInqProtseqsbefore choosing among optional transports. - Check whether a compatibility layer or constrained environment exposes a reduced RPC transport set.
Do not treat this as a DNS or firewall error. No remote connection has to be attempted for the runtime to determine that no usable protocol sequence exists.
References
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