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12154 usually means you either
- didn't configure tnsnames.ora with the alias you're trying to use, or
- didn't configure it correctly, or
- configured the wrong tnsnames.ora
Does it have an entry for TAPTI?
Are you able to connect outside the ASPNET providers with that same alias? SQLPlus for example?
Just for kicks, do a search on the whole machine for "oci.dll"... any place you find that dll could be an Oracle Home. Then for each Oracle Home you find, copy the tnsnames.ora file with the alias into the /NETWORK/ADMIN directory.
Its possible that in the case you describe, it's somehow using a different Oracle home than you expect.