Díky za odpověď.
Že je to problém firewallu je celkem jasné, jde o to, jak přesměrovat porty tak, aby FTP skrze firewall prošlo. FTP server ve vnitřní síti funguje dobře. Na ASUSu fungovalo dobře, zapojím Turris, přesměruji porty stejně, jako jsem měl na ASUSu a nejde to.
Jinak já neprovozuju FTP na portu 21, ale na portu 22333 a port range mám na 60000-61000, takhle už asi 5 let. Turris je holt moc chytrý zařízení a nejde to jednodušše, ale nejsem síťař a zřejmě si s tím nedovadu poradit.

výpis z klienta:

Stav:  Připojování k 78.*.*.*:22333...
Stav:  Připojení navázáno, čekání na uvítací zprávu...
Stav:  Inicializace TLS...
Stav:  Ověřování certifikátu...
Stav:  TLS connection established.
Stav:  Připojen
Stav:  Načítání výpisu složky...
Příkaz:  PWD
Odpověď:  257 "/" is current directory.
Příkaz:  TYPE I
Odpověď:  200 Type set to I
Příkaz:  PASV
Odpověď:  227 Entering Passive Mode (78,*,*,*,237,173)
Příkaz:  MLSD
Chyba:  GnuTLS error -15: An unexpected TLS packet was received.
Chyba:  Pokus o připojení přerušen: ECONNABORTED - Connection aborted

výpis ze serveru:

(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> Connected on port 22333, sending welcome message...
(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 220 FileZilla Server 0.9.53 beta
(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> AUTH TLS
(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 234 Using authentication type TLS
(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> SSL connection established
(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> USER htpc
(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 331 Password required for htpc
(000001)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> PASS ********
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 230 Logged on
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> SYST
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 215 UNIX emulated by FileZilla
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> FEAT
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 211-Features:
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  MDTM
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  REST STREAM
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  SIZE
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  MLST type*;size*;modify*;
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  MLSD
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  AUTH SSL
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  AUTH TLS
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  PROT
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  PBSZ
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  UTF8
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  CLNT
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  MFMT
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  EPSV
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)>  EPRT
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 211 End
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> PBSZ 0
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 200 PBSZ=0
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> PROT P
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 200 Protection level set to P
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> PWD
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 257 "/" is current directory.
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> TYPE I
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 200 Type set to I
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> PASV
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> 227 Entering Passive Mode (78,*,*,*,*,251)
(000001)09.12.2015 16:58:35 - htpc (95.211.148.244)> MLSD
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> Connected on port 22333, sending welcome message...
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 220 FileZilla Server 0.9.53 beta
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> —
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> “VhOwJN|?Ý÷éń&=ˆööÎC5Ýß0ŮfŹĄĂk 4ŢlŽ2ňLm@z[B`Şśaq‰•ţů)*jŔëŰůĂOď
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> dŔ,Ŕ‡Ŕ$Ŕ
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> ŔsŔ­Ŕ+Ŕ†Ŕ#Ŕ  ŔrŔ¬Ŕ0Ŕ‹Ŕ(ŔŔwŔ/ŔŠŔ'ŔŔv
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> ťŔ{
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> =
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 5
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> Ŕ
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> „Ŕť
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> śŔz
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> <
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> /
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> ş
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> AŔś
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> źŔ}
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> k
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 9
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> Ä
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> ˆŔź
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> žŔ|
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> g
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 3
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> ľ
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> EŔž
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> ć
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> #
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>  ˛ŞÖexNüú‚ß«rëZplóÝcťfq˙C™OF\¦ÝźŻ÷Ő‹ĘPĄ) ąîV•…S=0[DâRßM¤[ĺÓŕL€%îNęE~ÄĘŇ^@ß™Ň˙d™e—d»}l<1ß™OŮĂüƒdŹ¬‘÷ˆ’ۢM©
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> uš÷“^C˘:9leÍ$ęŤ<ˆů‹bM¨ëĆYäžg“ĐŰš)÷
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>

(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)>
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> 500 Syntax error, command unrecognized.
(000002)09.12.2015 16:58:35 - (not logged in) (95.211.148.244)> disconnected.
(000001)09.12.2015 16:58:45 - htpc (95.211.148.244)> disconnected.