TNSacket writer failure

Hello!
I got very strange problem. My Db and SID has name RTCCS and when I tried to start SVRMGRL I got error message
$ export ORACLE_SID=RTCCS
$ svrmgrl

Oracle Server Manager Release 3.1.6.0.0 - Production

Copyright (c) 1997, 1999, Oracle Corporation. All Rights Reserved.

ORA-12571: TNSacket writer failure
SVRMGR> exit

In trace file I found message too

nsdo: transport write error
nserror: entry
nserror: nsres: id=0, op=67, ns=12571, ns2=12560; nt[0]=530, nt[1]=3, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0
nsdo: nsctxrnk=0
nsdo: error exit
nioqsm: send-break: failed to send OOB break...
nioqper: error from send-marker
nioqper: nr err code: 0
nioqper: ns main err code: 12571
nioqper: ns (2) err code: 12560
nioqper: nt main err code: 530
nioqper: nt (2) err code: 3
nioqper: nt OS err code: 0

But I can start my Db with different SID, for example rtccs, without any problem
$ export ORACLE_SID=rtccs
$ svrmgrl

Oracle Server Manager Release 3.1.6.0.0 - Production

Copyright (c) 1997, 1999, Oracle Corporation. All Rights Reserved.

Oracle8i Enterprise Edition Release 8.1.6.3.0 - Production
With the Partitioning option
JServer Release 8.1.6.3.0 - Production

SVRMGR> connect internal
Connected.
SVRMGR> select * from v$database;
DBID NAME CREATED RESETLOGS_ RESETLOGS PRIOR_RESE PRIOR_RES LOG_MODE CHECKPOINT ARCHIVE_CH CONTROL CONTROLFI CONTROLFIL CONTROLFIL CONTROLFI OPEN_RESETL VERSION_T OPEN_MODE
---------- --------- --------- ---------- --------- ---------- --------- ------------ ---------- ---------- ------- --------- ---------- ---------- --------- ----------- --------- ----------
609588797 RTCCS 04-MAY-01 45159261 24-OCT-01 1 04-MAY-01 ARCHIVELOG 46180744 45979033 CURRENT 04-MAY-01 211246 46262364 31-OCT-01 NOT ALLOWED 24-OCT-01 READ WRITE
1 row selected.
SVRMGR>
Any idea ? I did not have any problem before with this Db.