Local Packet Filters

Besides iptables are there any other packet filters in Ubuntu?

I'm trying to run a tool and it says that a local packet filter is blocking it.
I checked iptables and ufw and don't see any rules loaded.

What other packet filter could be blocking the tool from running?

 

As a matter of interest what tool are you trying to run ? Maybe you need to reinstall it or reconfigure it ? Eg. hddtemp daemon listens on port 7634 - you can run sudo dpkg-reconfigure <packagename> to answer the config question(s) again.
What is the full output when you run the tool from terminal ?

 

Code:

# lft -E -V -S www.wilderssecurity.com
Setting my ISN = 583708272
SEND TTL=0 TSEQ=130600769 FLAGS=1
SEND TTL=1 TSEQ=1620080557 FLAGS=1
SEND TTL=2 TSEQ=289367011 FLAGS=1
SEND TTL=3 TSEQ=1251735866 FLAGS=1
SEND TTL=4 TSEQ=1100380911 FLAGS=1
SEND TTL=0 TSEQ=1866407378 FLAGS=1
SEND TTL=1 TSEQ=591121198 FLAGS=1
SEND TTL=2 TSEQ=1713968061 FLAGS=1
SEND TTL=3 TSEQ=694589219 FLAGS=1
SEND TTL=4 TSEQ=1265003394 FLAGS=1
SEND TTL=0 TSEQ=1990517898 FLAGS=1
SEND TTL=1 TSEQ=611538595 FLAGS=1
SEND TTL=2 TSEQ=1687552254 FLAGS=1
SEND TTL=3 TSEQ=1151429089 FLAGS=1
SEND TTL=4 TSEQ=1831270677 FLAGS=1
SEND TTL=5 TSEQ=418521168 FLAGS=1
Sending FIRST PACKET for hop 0
SEND TTL=0 TSEQ=302036237 FLAGS=2
SEND TTL=6 TSEQ=1031453617 FLAGS=1
Sending FIRST PACKET for hop 1
SEND TTL=1 TSEQ=211169829 FLAGS=2
Sending FIRST PACKET for hop 2
SEND TTL=2 TSEQ=1914045655 FLAGS=2
Sending FIRST PACKET for hop 3
SEND TTL=3 TSEQ=1995602723 FLAGS=2
Sending FIRST PACKET for hop 4
SEND TTL=4 TSEQ=1341763911 FLAGS=2
SEND TTL=5 TSEQ=1692723661 FLAGS=1
SEND TTL=0 TSEQ=2106428100 FLAGS=2
SEND TTL=1 TSEQ=368242436 FLAGS=2
SEND TTL=2 TSEQ=1452553790 FLAGS=2
SEND TTL=6 TSEQ=741296952 FLAGS=1
SEND TTL=3 TSEQ=1851461765 FLAGS=2
SEND TTL=4 TSEQ=632817574 FLAGS=2
SEND TTL=5 TSEQ=1928458772 FLAGS=1
SEND TTL=0 TSEQ=287686389 FLAGS=2
SEND TTL=1 TSEQ=763418343 FLAGS=2
SEND TTL=2 TSEQ=1401055681 FLAGS=2
SEND TTL=6 TSEQ=577053400 FLAGS=1
SEND TTL=3 TSEQ=2015154210 FLAGS=2
SEND TTL=4 TSEQ=353952945 FLAGS=2
Sending FIRST PACKET for hop 5
SEND TTL=5 TSEQ=295977130 FLAGS=2
SEND TTL=7 TSEQ=458791760 FLAGS=1
SEND TTL=8 TSEQ=2067921006 FLAGS=1
Sending FIRST PACKET for hop 6
SEND TTL=6 TSEQ=990566349 FLAGS=2


LFT can't seem to round-trip.  Local packet filter in the way?Concluding with 1 hops.

TTL  LFT trace to wilderssecurity.com (66.227.46.190):80/tcp
**   [80/tcp failed]  Try alternate options or use -V to see packets.

There is either a packet filter running or this error occurs for another reason?
As far as I could determine I found no traditional packet filters running on my system.

 

is it a remote, locate packet filter??

edit. 80/tcp failed. maybe it's your browser blocking it. but, i don't really know tbh.

 

It is also possible that some routers drop packets. Does not have to be a local problem at all. There could be a million contributing factors, including your ISP. Did you try different computers/distros, with and without your router, different sites, etc.

Regards,
Mrk

 

Mtr is quite a useful tool, traceroute and ping combined.