Public Sub UseDns() ' Create a DnsPermission instance. Dim myPermission As New DnsPermission(PermissionState.Unrestricted) ' Check for permission. myPermission.Demand() ' Create an identical copy of the above DnsPermission object.
r2 - 2013-02-26 - 13:44:36 - SteveKostecke You are here: NTP > Servers Web > ServerForm > UseDNS NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. [FIXED] OpenSSH Slow: Hanging at SSH2_MSG_SERVICE_ACCEPT To fix this performance issue while connecting to a remote server using ssh, set the UseDNS to no as shown below in your /etc/ssh/sshd_config file. $ vi /etc/ssh/sshd_config UseDNS no Restart the openssh and connect to the remote server again, which should be quick this time and will not hang at SSH2_MSG_SERVICE_ACCEPTED. Directive 'UseDNS' is not allowed within a Match block
sshd_config(5) - OpenBSD manual pages
Last night I added UseDNS no to my sshd_config, after I restarted ssh via sudo service ssh restart, I found sshd not started and there is no process listened on port 22, but after I deleted UseDNS no, it will work as before.. I have compared with another server's sshd_config, only three lines are different (this server used sftp, so these lines are added): Slow login via SSH - Unix Sep 15, 2010 ssh slow connection to solaris 10 and 11 | Unixmen
If UseDNS is set to Yes, the ssh server does a reverse host lookup to find the name of the connecting client. This is necessary when host-based authentication is used or when you want last login information to display host names rather than IP addresses.
Sep 11, 2018 Fix slow SSH connections (delays) on Mac OS X "UseDNS no" rocks! I always connect from a virtualbox with winxp to my mac lion, I changed the parameter UseDNS to "no" and everything starts to work great! svn, winscp and all connections that go throw ssh! Thank you very much! juands Mar 13, 2012 #19 Scott's method is … IBM AIX: Various ssh problems after upgrading to OpenSSH 7.x