I am using wwwoffle running on the local machine for browsing the internet with
different browsers and share the cached data.

While in online mode the http access occasionally completely stalls for ca. 1
minute. At the same time other protocols (e.g. pop3) are working fine,
therefore it is not a general network problem.

Whenever this stall of www access happens dmesg shows an entry like this:
[ 5945.122506] TCP: request_sock_TCP: Possible SYN flooding on port 8080.
Sending cookies.  Check SNMP counters.

8080 is the port wwwoffle is listening for browser requests.

Searching for possible causes and solutions I found this information:
https://fossies.org/diffs/wwwoffle/2.9i_vs_2.9j/ChangeLog-diff.html

2013-04-05 [r2188]  Andrew M. Bishop <amb>

            * src/sockets4.c, src/sockets6.c: Increase the listen() backlog
              parameter to avoid exceeding it and hitting Linux SYN flood
              detection/protection limits.

Would it be possible to upgrade wwwoffle to 2.9j or to include this fix?