550 Prohibited file name: .pureftpd-upload + critical error + contact admin in forum

[keudal]

We exchanged today through my filezilla client with a trusty friend some data (video + audio video files the day before). We had both the password for this common server on my machine (he is in paris me in the south west of france, 2 different locations and machines), ready that we were to only use it for this exchange and re-configurate later the server. Unfortunately, when i deleted the whole files, it remained 2 in a "prefs" of the public_html:
550 Prohibited file name: .pureftpd-upload.49a01112.15.4127.1db34fbf and .pureftpd-upload.49a00928.15.1f63.841bf5d1, both cant be retrieved in anyways, match my whole hard disk when compared to the local server (which ever is selected); cannot delete or rename them. As well, trying to upload these files got me a critical error.
DESPITE IT, WE HAD NO PB TRANSFEERING THE FILES ONE WAY OR THE OTHER (but is this procedure allowed? i doubt it ... now).

I would like to know:
-if this procedure is allowed or forbidden
-if i can change my password keeping the same host name on the local
server
-if these 2 files may harm or not the security of the exchanges (in normal conditions and in case i could change my password)

• if they could have been introduced here to hack voluntarly my server a3356674 hosted @ 216.108.235.38 (distant) or if it is just a consequence of a dysfunctional connexion and exchange;
• if i order to sharpen risks in the future i should prefer to open a new account (new host name)?

I should add that i can delete with no pb my other accounts, one being hosted at the same root, with the same name of server a3356674, presenting the same characteristic, and this one too (it was unchanged when i reinstall filezilla and reconnect my local server)

I ask you to forgive me for this way to practice filezilla (i know pass exchange is never a safe way), but were not very used to it and it was a pretty much emergent work, that finaly we success to provide in the deadlines, and with the only help of this very practical soft i wish to keep in my favourites...

list of event follows:

Statut: Connexion à 216.108.235.38:21...
Statut: Connexion établie, attente du message d'accueil...
Réponse: 220---------- Welcome to Pure-FTPd [TLS] ----------
Réponse: 220-You are user number 21 of 500 allowed.
Réponse: 220-Local time is now 17:41. Server port: 21.
Réponse: 220-This is a private system - No anonymous login
Réponse: 220 You will be disconnected after 3 minutes of inactivity.
Commande: USER a3356674
Réponse: 331 User a3356674 OK. Password required
Commande: PASS
Réponse: 230-User a3356674 has group access to: a3356674
Réponse: 230-OK. Current restricted directory is /
Réponse: 230-51 files used (0%) - authorized: 6000 files
Réponse: 230 428152 Kbytes used (27%) - authorized: 1536000 Kb
Commande: SYST
Réponse: 215 UNIX Type: L8
Commande: FEAT
Réponse: 211-Extensions supported:
Réponse: EPRT
Réponse: IDLE
Réponse: MDTM
Réponse: SIZE
Réponse: REST STREAM
Réponse: MLST type*;size*;sizd*;modify*;UNIX.mode*;UNIX.uid*;UNIX.gid*;unique*;
Réponse: MLSD
Réponse: ESTP
Réponse: PASV
Réponse: EPSV
Réponse: SPSV
Réponse: ESTA
Réponse: AUTH TLS
Réponse: PBSZ
Réponse: PROT
Réponse: 211 End.
Statut: Connecté
Statut: Récupération du contenu du dossier...
Commande: PWD
Réponse: 257 "/" is your current location
Commande: TYPE I
Réponse: 200 TYPE is now 8-bit binary
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,33,86)
Commande: LIST
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 7 matches total
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,7,130)
Commande: LIST -a
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 7 matches total
Trace: Server seems to support LIST -a
Statut: Calcul du décalage horaire du serveur...
Commande: MDTM .ftpquota
Réponse: 213 20090304195736
Statut: Décalage du fuseau horaire : Serveur : -28800 secondes, Local : 0 secondes. Différence : 28800 secondes.
Statut: Succès de la lecture du contenu du dossier
Statut: Récupération du contenu du dossier...
Commande: CWD public_html
Réponse: 250 OK. Current directory is /public_html
Commande: PWD
Réponse: 257 "/public_html" is your current location
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,130,228)
Commande: LIST -a
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 3 matches total
Statut: Succès de la lecture du contenu du dossier
Statut: Récupération du contenu du dossier...
Commande: CWD public_html
Réponse: 250 OK. Current directory is /public_html/public_html
Commande: PWD
Réponse: 257 "/public_html/public_html" is your current location
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,180,61)
Commande: LIST -a
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 3 matches total
Statut: Succès de la lecture du contenu du dossier
Statut: Récupération du contenu du dossier...
Commande: CWD prefs
Réponse: 250 OK. Current directory is /public_html/public_html/prefs
Commande: PWD
Réponse: 257 "/public_html/public_html/prefs" is your current location
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,133,30)
Commande: LIST -a
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 4 matches total
Statut: Succès de la lecture du contenu du dossier
Commande: DELE .pureftpd-upload.49a00928.15.1f63.841bf5d1
Réponse: 550 Prohibited file name: .pureftpd-upload.49a00928.15.1f63.841bf5d1
Commande: DELE .pureftpd-upload.49a01112.15.4127.1db34fbf
Réponse: 550 Prohibited file name: .pureftpd-upload.49a01112.15.4127.1db34fbf
Statut: Récupération du contenu du dossier...
Commande: CDUP
Réponse: 250 OK. Current directory is /public_html/public_html
Commande: PWD
Réponse: 257 "/public_html/public_html" is your current location
Statut: Succès de la lecture du contenu du dossier
Statut: Récupération du contenu du dossier...
Commande: CWD /public_html/public_html/prefs
Réponse: 250 OK. Current directory is /public_html/public_html/prefs
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,81,55)
Commande: LIST -a
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 4 matches total
Statut: Succès de la lecture du contenu du dossier
Statut: Connexion à 216.108.235.38:21...
Statut: Connexion établie, attente du message d'accueil...
Réponse: 220---------- Welcome to Pure-FTPd [TLS] ----------
Réponse: 220-You are user number 21 of 500 allowed.
Réponse: 220-Local time is now 17:42. Server port: 21.
Réponse: 220-This is a private system - No anonymous login
Réponse: 220 You will be disconnected after 3 minutes of inactivity.
Commande: USER a3356674
Réponse: 331 User a3356674 OK. Password required
Commande: PASS
Réponse: 230-User a3356674 has group access to: a3356674
Réponse: 230-OK. Current restricted directory is /
Réponse: 230-51 files used (0%) - authorized: 6000 files
Réponse: 230 428152 Kbytes used (27%) - authorized: 1536000 Kb
Statut: Connecté
Statut: Démarrage du téléchargement de /public_html/public_html/prefs/.pureftpd-upload.49a00928.15.1f63.841bf5d1
Commande: CWD /public_html/public_html/prefs
Réponse: 250 OK. Current directory is /public_html/public_html/prefs
Commande: PWD
Réponse: 257 "/public_html/public_html/prefs" is your current location
Commande: TYPE A
Réponse: 200 TYPE is now ASCII
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,71,33)
Commande: RETR .pureftpd-upload.49a00928.15.1f63.841bf5d1
Réponse: 550 Prohibited file name: .pureftpd-upload.49a00928.15.1f63.841bf5d1
Erreur: Erreur critique
Statut: Démarrage du téléchargement de /public_html/public_html/prefs/.pureftpd-upload.49a01112.15.4127.1db34fbf
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,7,89)
Commande: RETR .pureftpd-upload.49a01112.15.4127.1db34fbf
Réponse: 550 Prohibited file name: .pureftpd-upload.49a01112.15.4127.1db34fbf
Erreur: Erreur critique
Statut: Récupération du contenu du dossier...
Commande: CWD /lenvelopp.mp3
Réponse: 250 OK. Current directory is /lenvelopp.mp3
Commande: PWD
Réponse: 257 "/lenvelopp.mp3" is your current location
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,126,131)
Commande: LIST -a
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 2 matches total
Statut: Succès de la lecture du contenu du dossier
Statut: Récupération du contenu du dossier...
Commande: CWD /urh.htm
Réponse: 250 OK. Current directory is /urh.htm
Commande: PWD
Réponse: 257 "/urh.htm" is your current location
Commande: PASV
Réponse: 227 Entering Passive Mode (216,108,235,38,90,182)
Commande: LIST -a
Réponse: 150 Accepted data connection
Réponse: 226-ASCII
Réponse: 226-Options: -a -l
Réponse: 226 2 matches total
Statut: Succès de la lecture du contenu du dossier
Statut: Récupération du contenu du dossier...
Commande: CWD /public_html
Réponse: 250 OK. Current directory is /public_html
Commande: PWD
Réponse: 257 "/public_html" is your current location
Statut: Succès de la lecture du contenu du dossier
Statut: Déconnecté du serveur