[Users] Unrecognized static network settings

[Slavko]

Ahoj,

Dňa Wed, 10 Feb 2016 16:38:42 +0100 Ricardo Mones <ricardo at mones.org>
napísal:

> On Wed, Feb 10, 2016 at 02:55:31PM +0100, Andrej Kacian wrote:
> > On Wed, 10 Feb 2016 13:22:37 +0100
> > Michael Schwendt <bugs.michael at gmx.net> wrote:
> > 
> > > > $ telnet imap.gmail.com 993
> > > > Trying 64.233.184.108...
> > > > [hangs indefinetely]  
> > > 
> > I agree here - this seems to be a problem (or policy) with that
> > particular network you are connecting from, and is not specific to
> > Claws Mail. I suggest talking to administrator of that network.
> 
> From gathering all things tried so far seems there's some transparent
> proxy/router blocking those ports.

I miss the start of this thread, then i don't know on which OS the OP
is, but i see, that the OP is not familiar with network...

Beside the network admins, was there inspection about local
firewall? If he follow some restrictive iptables howto, it can get
hangs:

a) without blocking to closed port (on my LAN):

telnet raspi.skk 993
Trying 192.168.0.10...
telnet: connect to address 192.168.0.10: Connection refused

b) with DROPed packets on my local FW (iptables -A OUTPUT -p tcp
--dport 993 -j DROP):

telnet raspi.skk 993
Trying 192.168.0.10...
(hangs...)
telnet: connect to address 192.168.0.10: Connection timed out

One can identify these DROPs by tcptraceroute:

a) without local block:

tcptraceroute -q1 -n imap.gmail.com 993
Selected device br0, address 192.168.0.1, port 55083 for outgoing packets
Tracing the path to imap.gmail.com (64.233.184.109) on TCP port 993 (imaps), 30 hops max
 1  192.168.0.254  0.313 ms
 etc...

b) with local DROP:

tcptraceroute -q1 -n imap.gmail.com 993
Selected device br0, address 192.168.0.1, port 53444 for outgoing packets
Tracing the path to imap.gmail.com (64.233.184.108) on TCP port 993 (imaps), 30 hops max
libnet_write failed?  Attempted to write 40 bytes, only wrote -1

c) with DROPs somewhere on the path (i have no real example, but here
at hop 2 the packets are dropped):

tcptraceroute -q1 -n imap.gmail.com 993
Selected device br0, address 192.168.0.1, port 55083 for outgoing packets
Tracing the path to imap.gmail.com (64.233.184.109) on TCP port 993 (imaps), 30 hops max
 1  192.168.0.254  0.313 ms
 2  *
 3  *
 etc..

regards

-- 
Slavko
http://slavino.sk
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