NetBackup for Oracle : ORA-27029 error while restoring db

Encountered the following error while restoring database from master server:


RMAN> RUN {
ALLOCATE CHANNEL ch00
TYPE 'SBT_TAPE';
SEND 'NB_ORA_SERV=servername.mtv.ccc.com';
RESTORE ARCHIVELOG FROM SEQUENCE 4170 UNTIL SEQUENCE 4217;
RELEASE CHANNEL ch00;
}
2> 3> 4> 5> 6> 7>
allocated channel: ch00
channel ch00: sid=7 devtype=SBT_TAPE
channel ch00: Veritas NetBackup for Oracle - Release 7.0 (2010010418)

sent command to channel: ch00

Starting restore at 02-DEC-11

channel ch00: starting archive log restore to default destination
channel ch00: restoring archive log
archive log thread=1 sequence=4170
channel ch00: restoring archive log
archive log thread=1 sequence=4171
channel ch00: restoring archive log
archive log thread=1 sequence=4172
channel ch00: restoring archive log
archive log thread=1 sequence=4173
channel ch00: restoring archive log
archive log thread=1 sequence=4174
channel ch00: restoring archive log
archive log thread=1 sequence=4175
channel ch00: restoring archive log
archive log thread=1 sequence=4176
channel ch00: restoring archive log
archive log thread=1 sequence=4177
channel ch00: restoring archive log
archive log thread=1 sequence=4178
channel ch00: restoring archive log
archive log thread=1 sequence=4179
channel ch00: restoring archive log
archive log thread=1 sequence=4180
channel ch00: restoring archive log
archive log thread=1 sequence=4181
channel ch00: restoring archive log
archive log thread=1 sequence=4182
channel ch00: restoring archive log
archive log thread=1 sequence=4183
channel ch00: restoring archive log
archive log thread=1 sequence=4184
channel ch00: restoring archive log
archive log thread=1 sequence=4185
channel ch00: restoring archive log
archive log thread=1 sequence=4186
channel ch00: restoring archive log
archive log thread=1 sequence=4187
channel ch00: restoring archive log
archive log thread=1 sequence=4188
channel ch00: restoring archive log
archive log thread=1 sequence=4189
channel ch00: restoring archive log
archive log thread=1 sequence=4190
channel ch00: restoring archive log
archive log thread=1 sequence=4191
channel ch00: restoring archive log
archive log thread=1 sequence=4192
channel ch00: restoring archive log
archive log thread=1 sequence=4193
channel ch00: restoring archive log
archive log thread=1 sequence=4194
channel ch00: restoring archive log
archive log thread=1 sequence=4195
channel ch00: restoring archive log
archive log thread=1 sequence=4196
channel ch00: restoring archive log
archive log thread=1 sequence=4197
channel ch00: restoring archive log
archive log thread=1 sequence=4198
channel ch00: restoring archive log
archive log thread=1 sequence=4199
channel ch00: restoring archive log
archive log thread=1 sequence=4200
channel ch00: restoring archive log
archive log thread=1 sequence=4201
channel ch00: restoring archive log
archive log thread=1 sequence=4202
channel ch00: restoring archive log
archive log thread=1 sequence=4203
channel ch00: restoring archive log
archive log thread=1 sequence=4204
channel ch00: restoring archive log
archive log thread=1 sequence=4205
channel ch00: restoring archive log
archive log thread=1 sequence=4206
channel ch00: restoring archive log
archive log thread=1 sequence=4207
channel ch00: restoring archive log
archive log thread=1 sequence=4208
channel ch00: restoring archive log
archive log thread=1 sequence=4209
channel ch00: restoring archive log
archive log thread=1 sequence=4210
channel ch00: restoring archive log
archive log thread=1 sequence=4211
channel ch00: restoring archive log
archive log thread=1 sequence=4212
channel ch00: restoring archive log
archive log thread=1 sequence=4213
channel ch00: restoring archive log
archive log thread=1 sequence=4214
channel ch00: restoring archive log
archive log thread=1 sequence=4215
channel ch00: restoring archive log
archive log thread=1 sequence=4216
channel ch00: restoring archive log
archive log thread=1 sequence=4217
released channel: ch00
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 12/02/2011 12:23:24
ORA-19507: failed to retrieve sequential file, handle="arch_u50msg690_s160_p1_t768088352", parms=""
ORA-27029: skgfrtrv: sbtrestore returned error
ORA-19511: Error received from media manager layer, error text:
VxBSAValidateFeatureId: Failed with error:
Server Status: cannot connect on socket

RMAN> quit


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Solution:
Found the server name is wrongly specified in the /etc/hosts.
This can also happened if name in bp.conf and /etc/hosts and dns must be matching.
This is normally network related, can be due to firewall sometimes.
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