Internet connection to all but one IP address

Dear Community,
I'm recently facing a problem to connect to our company server (smb, nameserver etc). I can access (ping all IP addresses but this one). For this particular IP address I'm receiving ICMP timeouts. It is worth to note that this server has an internal (private) and an external (public) IP address. I only cannot acces the private IP address when I'm connected to our company network. I can ping the external IP address (from outside).
I've unsuccessfully tried the following (same behaviour - ICMP timeouts on this particular private IP address):
- tried WiFi and Ethernet connections
- switched off firewall
- switched off sophos anti virus
- deleted cisco VPN
- assigned a static IP address (manually - that I just freed - from my Iphone)
- checked the routing table
- checked proxy settings
- cleared the ARP cache
- monitored system.log (while ping)
- monitored appfirewall.log (while ping)
- upgraded from 10.7 to 10.8
- booted in safe mode
- booted the rescue system
- spoofed my Ethernet Mac address (our dhcpd does NOT deny unknown MAC address, which makes me think it really is my MBP)
Do anyone have more hint to try or which log files I should monitor to find out what the problem could be?
Thanks,
Sven

First thing to try is renewing the DHCP lease.
System Preferences > Network.
Do you have a green dot next to Ethernet? If so, with ethernet selected in the left pane;
Check the location is set to 'automatic'
Check 'configure IPv4' is set to DHCP
Click the 'Advanced' button
Check that DHCP is selected in that window for IPv4
Turn off IPv6 (gives a conflict on some routers)
Click the button 'renew DHCP lease'
That should persuade the router to give you a different IP.

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