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"Why Can't I Connect?" makes it easier to resolve TCP/IP connection errors. Use it to diagnose connections to common server types and create generic clients and / or servers. A source tar, a 32 bit and 64 bit rpm, a 32 bit and 64 bit deb, and a 32 bit Windows install exe are available. The 32 bit Windows executable runs fine in 64 bit Windows systems.

Features:

Network debugging
Network diagnostics
Email connection debugging
Database connection debugging
LDAP connection debugging
Internet relay chat connection debugging
Usenet connection debugging
Network intrusion detection