firewall blocks ispcp server due to portscans

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Hi,

Installed ispCP 1.0.7 as usual on a brand new Debian 5.0. No special configs so far, works great. Its meant to be used as an internal dev server. However there is a problem with the firewall (watchguard). It registers portscans coming from the machine and blocks it from the net.

Is it possible that one of the services utilized by ispCP creates anything that could be or look like a portscan? Yes, nmap and hping are installed, both of which can be used to scan ports. Yet I'm the only user on the machine, therefore would know about their usage.

Thanks for any hint you might have

cu
Roman