Unable to connect using TOAD

Hi All,
I'm not able to connect to DB using TOAD. While connecting I'm getting the below error:
ora 01304 oracle not available
ora 27101 shared memory realm does not exist
linux-x86_64 error 2 no such file or directory
To resolve the above issue, I reloaded the listener. After reloading the listener I was able to connect to DB.
But after some I got the same error and wasn't able to connect.
Means when listerner is reloaded I'm able to connect but after some time getting the same issue. I'm not getting the reason why its happening.
Please advise.
Thanks.
Ashwani N.

Hi All,
I'm using the below TNS entry to connect through TOAD.
In this host1 is my primary server (up and running) and host2 is my physical standby server(mounted). With the below TNS entry its directing me to the standy by and I'm getting the error:
Oracle Initialization or Shutdown in progress.
DG_TEST =
(DESCRIPTION_LIST =
(DESCRIPTION =
(FAILOVER=ON)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = <host1>)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XYZ)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = PRECONNECT)
(RETRIES = 20)
(DELAY = 30)
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =host2)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XYZ)
Please Advice.
Thanks.
Ashwani N.

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Peculiar.
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>
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