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So source 192.168.20.5 is blocked. However:
rene@trololo:~$ sudo ufw status
Status: actief
Naar Actie Van
---- ----- ---
Anywhere ALLOW 192.168.20.0/24
It doesn't get simpler than this, doesn't it?
With source port 443 it looks like it's blocking the tcp handshake on an ssl connection. However, I do not experience any difficulties connecting between the hosts.
Is 192.168.20.20 the IP address of the system on which the log entries are generated?
The packet being blocked does seem to be a SYN/ACK reply to a TCP connection to port 443 on 192.168.20.5. It could be a duplicate generated by WLAN interference, or 192.168.20.5 may be responding to a spoofed SYN package.
From what I've read, UFS is an application/interface built on top of netfilter/iptables. Could you post the output from iptables-save?
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