Is this some kind of DOS attack?

some of my servers have been crashing a lot lately.

I found this in the logs before one server crashed today, could this be some kind of dos attack?


Aug 16 05:32:41 www named[21993]: client 68.115.186.114#29873: update 'rhinon.com/IN' denied
Aug 16 05:32:51 www proftpd[24239]: 63.85.123.4 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24239]: 63.85.123.4 (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:51 www proftpd[24284]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24284]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:51 www proftpd[24289]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24289]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:51 www proftpd[24273]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24273]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:51 www proftpd[24244]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24244]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:51 www proftpd[24238]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24238]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:51 www proftpd[24248]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24255]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24260]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24245]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24257]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24266]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24250]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24270]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24254]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24268]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24256]: 63.85.123.138 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24278]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24282]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24287]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24276]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24280]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24285]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24241]: 63.85.123.7 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:51 www proftpd[24240]: 63.85.123.6 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24249]: 63.85.123.133 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24264]: 63.85.123.155 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24243]: 63.85.123.14 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24251]: 63.85.123.135 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24269]: 63.85.123.159 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24259]: 63.85.123.142 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24246]: 63.85.123.131 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24248]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24242]: 63.85.123.11 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24267]: 63.85.123.157 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24258]: 63.85.123.140 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24255]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24260]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24245]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24257]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24266]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24250]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24270]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24299]: 63.85.123.153 (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:52 www proftpd[24254]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24268]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24256]: 63.85.123.138 (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24278]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:52 www proftpd[24282]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:53 www proftpd[24287]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:53 www proftpd[24276]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:53 www proftpd[24280]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:53 www proftpd[24285]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:53 www proftpd[24241]: 63.85.123.7 (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:53 www proftpd[24302]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:53 www proftpd[24308]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.
Aug 16 05:32:53 www proftpd[24240]: 63.85.123.6 (194.152.190.150[194.152.190.150]) - FTP session closed.
Aug 16 05:32:53 www proftpd[24303]: www.server4indallas.com (194.152.190.150[194.152.190.150]) - FTP session opened.

 

 

 

 

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