There is no problem with SIDs being the same name. Can you successfully ping the server? What happens if you remove the second address and just try via port 1521? If that fails, try just using the port 1526 address. Just for grins, you might try port 1522. At this point, your problem is probably not the tnsnames.ora file unless the port or IP address is wrong.

Also, check again to make sure you have privileges to connect to that server. Have the DBA check to see if your account on that server is locked and change the password.
>

agbp.world =
>  (DESCRIPTION =
>    (ADDRESS_LIST =
>        (ADDRESS =
>          (COMMUNITY = tcp.world)
>          (PROTOCOL = TCP)
>          (Host = 193.78.45.80)
>          (Port = 1521)
>        )
>        (ADDRESS =
>          (COMMUNITY = tcp.world)
>          (PROTOCOL = TCP)
>          (Host = 193.78.45.80)
>          (Port = 1526)
>        )
>    )
>    (CONNECT_DATA = (SID = prd1)
>    )
>  )