How to verify if SFTP access has been granted on a server

Alternatively, other than doing the "sftp -v" command mentioned above, you can always cat the SSH/SFTP logs stored on any server running sshd and direct them to a file for viewing.

A command set like the following would work, where 1.1.1 would be the /24 of the block you are trying to search.

cd /var/log/
cat secure.4 secure.3 secure.2 secure.1 secure |grep sshd| grep -v 1.1.1> /tmp/secure.sshd.txt
gzip -9 /tmp/secure.sshd.txt

One of the many ways to check for SFTP access using password based authentication:

sftp username@serverName

or

sftp username@serverIP

And then entering password.

You will get "Permission denied, please try again." message if it fails otherwise you will be allowed inside the server with screen-

sftp>

You can test it fully works with commands like ls, mkdir etc.

Try logging in.

Not being snarky -- that really is probably the simplest way. By 'verify[ing] that SFTP access has been granted," what you're really doing is checking is a particular l/p pair is recognized by the server.

Most servers have curl and scp installed, which you can use to log into an SFTP server. To test if your credentials work using curl, you could do this:

$ curl -u username sftp://example.org/
Enter host password for user 'username':

Enter your password and if it works you'll get a listing of files (like ls -al), if it doesn't work you'll get an error like this:

curl: (67) Authentication failure

You could also try using scp:

$ scp [email protected]:testing .
Password:
scp: testing: No such file or directory

This verifies that you that you were able to log in, but it couldn't find the testing file. If you weren't able to log in you'd get a message like this:

Permission denied, please try again.
Received disconnect from example.org: 2: ...error message...