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Jan
30
comment OpenSSH Can't Connect on Fedora 17
Outside a firewall as in not behind the firewall therefore not blocked? The first thing you need to check is that you have SSHD running and listening to port 22.
Jan
14
awarded  Nice Answer
Jan
11
comment Ran out of disk space, how to tar without creating copy
Transferring that much data to your average 4 GB stick would probably be painfully slow. And external drive would be better if he has a decent interface if the add-a-drive route is preferable.
Jan
8
comment Unable to ping my Ubuntu AWS instance
ICMP is mostly for diagnostics, like traceroute along with ping. What would you gain by trying to block out everything but just ping? (I'm not sure you could block everything but ping with the tools they have available, although I suppose on the VM you can use the firewall tools to try to refine it...)
Jan
3
awarded  Popular Question
Dec
14
comment qMail taking 30-60 Seconds to send a mail
I also see that your logs are throwing what looks like deferral messages because it can't deliver the message you're trying to send...
Dec
14
comment qMail taking 30-60 Seconds to send a mail
What are you trying to send, as in does it have an attachment? Have you used wireshark or another packets sniffer to see what, if anything, is happening between the client and server?
Nov
8
comment Spam mail through SMTP and user spoofing
Although if the OP wants he can also connect to the POP port and try retrieving mail from his mailbox using RFC commands for POP, if the server isn't using security to prevent it.
Nov
8
comment Spam mail through SMTP and user spoofing
@Sane if I send mail to my SMTP server on mydomain.com, how do you think it gets to your server at yourdomain.com where you retrieve it?
Nov
8
comment Spam mail through SMTP and user spoofing
@Sane ...um...how do you think two mail servers talk to each other? They don't use POP to retrieve mail between sites.
Nov
8
comment Spam mail through SMTP and user spoofing
Mail server A talks to mail server B using SMTP. You retrieve mail from your end-point mailbox with POP/IMAP/Exchange. Mail servers talk to each other in SMTP or a variant of it.
Nov
8
comment Spam mail through SMTP and user spoofing
@sane no, SMTP servers accept mail from other SMTP servers. It's transferring messages as the protocol name says.
Nov
8
comment Spam mail through SMTP and user spoofing
But @joeqwerty is right in that what you're doing with telnet is how any SMTP transfer works. You're using telnet as if it were a slow mail client or other SMTP server relaying email, and if you're connected as an authorized user from an authorized IP/domain to someone in that domain that the server accepts mail for or sending to a server that is authorized to take the message, it'll work just fine.
Nov
8
comment Spam mail through SMTP and user spoofing
Oh, and you can also configure your mail server to require authentication to send mail out. There are other layers you can add (SPF records, reverse lookups, etc.) to make it harder to send spoofed mail. All of which are server specific.
Nov
8
comment Spam mail through SMTP and user spoofing
Yes, you're right, but if he's wondering how to secure from spoofed messages, that's what you'd harden against. Usually the people that panic over this think it's how spammers are sending mails, but only if your server were an open relay accepting mail from anyone for anyone. Or some combination thereof...
Nov
8
comment Spam mail through SMTP and user spoofing
You limit who may send email through the SMTP server, and for whom the server will accept mail. Google "open relay."
Sep
21
awarded  Custodian
Sep
21
awarded  Enlightened
Sep
20
comment Deleting Users and their redirected data
Sorry, I'm not quite understanding. You have the directory structure such that grade9 contains grade9's three folders under them, or your redirection isn't stored under each grade's designation?
Sep
19
comment Deleting Users and their redirected data
Not as elegant as automated deletions, but we found it to be a nice balance in management for our situation.