Messages not processed by integration server after SP09 to SP16

Question

Operating System: Windows NT 2003 Standard edition Service Pack 1
Database: SQL_Server_8.00, DBSL:640.00 Patch Level: 100
ABAP Kernel: Non Unicode; Release: 640; Patch: 109;
XI: Version 3.0; Service Pack Stack:16
Host: PEARL; IPAddress: 10.1.1.13
We upgraded from service pack stack 09 to 16 and since then no messages
are getting routed to integration server. We tried a cache access
though TCODE: SXI_CACHE and it said "if_http_client receive
http_communication_failure". Then we went to ICM monitoring through
TCODE: SMICM and saw that the http service that runs on 8000 port is
inactive when we tried to activate it gave an error. Here is the
snapshot from the trace file.
[Thr 3492] *** ERROR => NiIBind: service '8000' (8000) in use
[nixxi_r.cpp 3845]
[Thr 3492] *** ERROR => NiIListen: NiBind (rc=-4) [nixxi_r.cpp
767]
[Thr 3492] *** ERROR => IcmBindService: NiBuf2Listen failed for host
PEARL:8000 (rc=-4): NIESERV_USED [icxxserv.c 1549]
When we tried to access runtime workbench through integration builder
webpage it says "page not found".
When we tried to login to the J2EE visual admin using the default
account(J2EE_admin) it gave the
error "http://pearl:8101/msgserver/text/logon returned empty list of
connection parameters."
In SAPMMC we looked at the system log and saw the error "SAP Basis
System: Operating system call gethostbyaddr failed (error no. 0 )".
We tried restarting the whole server but to no effect.

Answer 1

since your OS is Windows try following in command at prompt
C:>netstat -a
or
C:>netstat -an
one of the above will work in NT, the list shows the listening (Open) ports and ESTABLISHED (used)..check for the 8000 which is your HTTP port.
Also in SAP check the t-code "SMICM" and then goto services and see the HTTP services running without error or not?
Hint: Port names are defined in services file located at C:\WINDOWS\systemXX\drivers\etc\services  file..