strange new ports after restart...

something strange with our server... we cannot get ssh for about 10 minutes after a restart... immediately after restart, i run nmap from another server and got results:

PORT STATE SERVICE
111/tcp filtered rpcbind
113/tcp filtered auth
135/tcp filtered msrpc
136/tcp filtered profile
137/tcp filtered netbios-ns
138/tcp filtered netbios-dgm
139/tcp filtered netbios-ssn
445/tcp filtered microsoft-ds
513/tcp filtered login
1234/tcp filtered hotline
1433/tcp filtered ms-sql-s
1434/tcp filtered ms-sql-m
1524/tcp filtered ingreslock


but usualy we have only these services running:
PORT STATE SERVICE
20/tcp closed ftp-data
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
53/tcp open domain
80/tcp open http
110/tcp open pop-3
143/tcp open imap
443/tcp open https
993/tcp open imaps
995/tcp open pop3s

where are those port from after restart? is there an explanation?

thank you...

 

 

 

 

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