TSM Exchange backup fail error 418 .

Hi everyone,
                         after a programmed shutdown of our datacenter , the exchange backup is failing with the following error:

11/19/2017 13:37:01 ANS5216E Could not establish a TCP/IP connection with address 'VWARCOSSTSM01:1500'. The TCP/IP error is 'Unknown error' (errno = 10061).
11/19/2017 13:37:01 ANS9020E Could not establish a session with a TSM server or client agent.  The TSM return code is -50.
11/19/2017 13:37:01 ANS1017E Session rejected: TCP/IP connection failure.
11/19/2017 20:16:15 ANS1909E The scheduled command failed.
11/19/2017 20:16:15 ANS1512E Scheduled event 'VWARCOSVXMBX02_EXC' failed.  Return code = 418.
11/20/2017 20:07:29 ANS1909E The scheduled command failed.
11/20/2017 20:07:29 ANS1512E Scheduled event 'VWARCOSVXMBX02_EXC' failed.  Return code = 418.
11/21/2017 20:05:44 ANS1909E The scheduled command failed.
11/21/2017 20:05:44 ANS1512E Scheduled event 'VWARCOSVXMBX02_EXC' failed.  Return code = 418.

The exchange DB´s are healty and balanced,

any idea?

Thanks in advance.
Santiago videlaAsked:
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What server OS the Exchange is running? What Exchange version?
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Santiago videlaAuthor Commented:
exchange version: 2010
server:windows server 2008
writers with no fail status.
VWARCOSSTSM01- is that your backup server?
Have you confirmed you able to ping it?
Telnet to port 1500 works?
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Santiago videlaAuthor Commented:
Yes ronin that is my tsm server and the port is working ok . (telnet tested.)
Confirm there's no currently running or stuck job on the backup server side.
According to the error message it seems that TSM rejecting connection from Exchange.

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Santiago videlaAuthor Commented:
Ronin: no stucked job on the backup server.  minutes ago i  ran a full backup manually and it ended ok.

thanks in advance.

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