ftp connection error on command line

500 I won't open a connection to 172.31.xx.xxx (only to 19.216.xxx.xxx)ftp: bind: Address already in use

If you are trying to make a connection to ftp on command line and you are getting above error, it means ftp is trying to connect to the server using private IP but it cannot connect to remote server using private IP as it needs public IP. You have already passed public IP but still it is connecting to private IP and showing error 500. Here is solution for you.

Soluton :

Connect to ftp server in passive mode using -p

ftp -p ftp.domainname
or
ftp -p 19.216.xxx.xxx

It will ask username and password and after typing it, you should be able to connect to remote server successfully.

bitbucket pull/push error - gnutls_handshake() failed: Handshake failed

bitbucket gnutls handshake failed error :

If you are using ubuntu 14.04 or older and recently you start getting the error while pulling/pushing into git repository. All was working fine and suddently it stopped working.

You are not alone who are facing the issue. bitbucket removed support for libcurl3 version because of vulnerability. To use bitbucket, you should have libcurl4 installed in your system.

Solution :

Add following lines in the file /etc/apt/sources.list

deb http://security.ubuntu.com/ubuntu xenial-security main
deb http://cz.archive.ubuntu.com/ubuntu xenial main universe

Run :

sudo apt-get update && sudo apt-get install curl

If you are not able to install libcurl4 because of python dependencies errors on your Ubuntu machine. Follow approved solution on this link of stackoverflow and then follow above solution to install libcurl4.

 

tomcat error - tomcat authenticated - An attempt was made to authenticate the locked user "user"

You are getting 'Permission Denied' for some of the modules of your tomcat web application and you get error 'An attempt was made to authenticate the locked user "user"' in the log, here is the solution for you.

Solution :

The 'work' directory inside tomcat does not have enough permission to open the jsp files in the browser. You need to provide permission to 'work' directory. 'Owner' and 'Group' of the 'work' directory should be 'tomcat'

chown -R tomcat:tomcat /usr/share/tomcat/work

Your tomcat directory path may be different, it may be in /opt or in /var/lib/tomcat. Find your tomcat directory and provide it correct permission.