dataguard remote archival not working?

I just created a physical standby database.
I think I have everything set up correctly
but for some reason, the logs are not being
sent and applied to the stanby server.
Can some point to me where I'm wrong?
Below are the spiflies for the setup

PRIMARY DATABSE spfile
===================


*.background_dump_dest='/u28/ora01/MANGO/log/bdump'
*.compatible='9.2.0'
*.control_files='/u28/ora01/MANGO/control01.ctl','/u28/ora01/MANGO/control02.ctl'
*.core_dump_dest='/u28/ora01/MANGO/cdump'
*.db_block_size=8192
*.db_cache_size=104857600
*.db_domain=''
*.db_file_multiblock_read_count=16
*.db_name='MANGO'
*.fal_client='MANGO'
*.fal_server='MANGO'
*.fast_start_mttr_target=300
*.hash_join_enabled=TRUE
*.instance_name='MANGO'
*.java_pool_size=78643200
*.job_queue_processes=10
*.large_pool_size=8388608
*.log_archive_dest_1='LOCATION=/u28/ora04/MANGO/archive MANDATORY'
*.log_archive_dest_2='SERVICE=MANGO'
*.log_archive_dest_state_1='enable'
*.log_archive_dest_state_2='ENABLE'
*.log_archive_format='%t_%s.dbf'
*.LOG_ARCHIVE_START=true
*.log_checkpoints_to_alert=TRUE
*.nls_comp='BINARY'
*.nls_date_format='YYYY-MM-DD HH24:MI:SS'
*.nls_sort='BINARY'
*.open_cursors=300
*.optimizer_index_cost_adj=1
*.pga_aggregate_target=25165824
*.processes=150
*.query_rewrite_enabled='TRUE'
*.remote_login_passwordfile='exclusive'
*.shared_pool_size=262144000
*.sort_area_size=524288
*.standby_archive_dest='/u28/ora04/MANGO/archive'
*.standby_file_management='AUTO'
*.star_transformation_enabled='FALSE'
*.timed_statistics=TRUE
*.undo_management='AUTO'
*.undo_retention=10800
*.undo_tablespace='UNDOTBS1'
*.user_dump_dest='/u28/ora01/MANGO/udump'


STANDBY DATABSE spfile
=================================================


*.background_dump_dest='/u28/ora01/MANGO/log/bdump'
*.compatible='9.2.0'
*.control_files='/u28/ora01/MANGO/controlsep02.ctl'
*.core_dump_dest='/u28/ora01/MANGO/cdump'
*.db_block_size=8192
*.db_cache_size=104857600
*.db_domain=''
*.db_file_multiblock_read_count=16
*.db_name='MANGO'
*.fal_client='MANGO'
*.fal_server='MANGO'
*.fast_start_mttr_target=300
*.hash_join_enabled=TRUE
*.instance_name='MANGO'
*.java_pool_size=78643200
*.job_queue_processes=10
*.large_pool_size=8388608
*.log_archive_dest_1='LOCATION=/u28/ora04/MANGO/archive MANDATORY'
*.log_archive_dest_state_1='enable'
*.log_archive_format='%t_%s.dbf'
*.LOG_ARCHIVE_START=true
*.log_checkpoints_to_alert=TRUE
*.nls_comp='BINARY'
*.nls_date_format='YYYY-MM-DD HH24:MI:SS'
*.nls_sort='BINARY'
*.open_cursors=300
*.optimizer_index_cost_adj=1
*.pga_aggregate_target=25165824
*.processes=150
*.query_rewrite_enabled='TRUE'
*.remote_archive_enable='TRUE'
*.remote_login_passwordfile='exclusive'
*.shared_pool_size=262144000
*.sort_area_size=524288
*.standby_archive_dest='/u28/ora04/MANGO/archive'
*.standby_file_management='AUTO'
*.star_transformation_enabled='FALSE'
*.timed_statistics=TRUE
*.undo_management='AUTO'
*.undo_retention=10800
*.undo_tablespace='UNDOTBS1'
*.user_dump_dest='/u28/ora01/MANGO/udump'

Have you set up the tnsnames and listeners correctly? Can you tnsping the mango service? What do you see in your primary alertlog when you switch logfiles? Btw, where is your log transport mode in log_archive_dest_2? I don't see ARCH or LGWR specified. (I don't think it defaults to ARCH if nothing is specified).

log at v$archive_dest on the standby for clues

select destination, status , error from v$archive_log_dest

Is the standby on the same server?