https://community.qlik.com/t5/Official-Support-Articles/Qlik-Talend-Cloud-Too-many-bad-authentication-attempts-Too-many/ta-p/2545970 <P>Connecting to an SFTP server using username and password authentication fails with the error:</P> <P class="lia-indent-padding-left-30px"><FONT face="courier new,courier">Too many bad authentication attempts!&nbsp;</FONT><BR /><FONT face="courier new,courier">com.jcraft.jsch.JSchException: 11 Too many bad authentication attempts!</FONT></P> <H3><FONT color="#339966"><STRONG>Resolution</STRONG></FONT></H3> <P>The issue is caused by the password containing a backslash (<STRONG>\</STRONG>). A backslash is treated as a control or escape character and must be escaped accordingly.&nbsp;If not handled correctly, a control or escape character in a password can cause connection or authentication errors.</P> <P>Either remove the backslash (<STRONG>\</STRONG>) or replace it with a double backslash (<STRONG>\\</STRONG>) to escape it properly.</P> <P>Example:</P> <P>Previous, failing password: Test<STRONG>\</STRONG>123<BR />Updated password: Test<STRONG>\\</STRONG>123</P> <P>&nbsp;</P> <P>&nbsp;</P> <H4><FONT color="#339966"><STRONG>Environment</STRONG></FONT></H4> <UL> <LI>Qlik Talend Cloud</LI> <LI>Qlik Talend Data Integration</LI> </UL> Wed, 01 Apr 2026 10:14:03 GMT Chethankumar_JS 2026-04-01T10:14:03Z https://community.qlik.com/t5/Official-Support-Articles/Qlik-Talend-Cloud-Too-many-bad-authentication-attempts-Too-many/ta-p/2545970 <P>Connecting to an SFTP server using username and password authentication fails with the error:</P> <P class="lia-indent-padding-left-30px"><FONT face="courier new,courier">Too many bad authentication attempts!&nbsp;</FONT><BR /><FONT face="courier new,courier">com.jcraft.jsch.JSchException: 11 Too many bad authentication attempts!</FONT></P> <H3><FONT color="#339966"><STRONG>Resolution</STRONG></FONT></H3> <P>The issue is caused by the password containing a backslash (<STRONG>\</STRONG>). A backslash is treated as a control or escape character and must be escaped accordingly.&nbsp;If not handled correctly, a control or escape character in a password can cause connection or authentication errors.</P> <P>Either remove the backslash (<STRONG>\</STRONG>) or replace it with a double backslash (<STRONG>\\</STRONG>) to escape it properly.</P> <P>Example:</P> <P>Previous, failing password: Test<STRONG>\</STRONG>123<BR />Updated password: Test<STRONG>\\</STRONG>123</P> <P>&nbsp;</P> <P>&nbsp;</P> <H4><FONT color="#339966"><STRONG>Environment</STRONG></FONT></H4> <UL> <LI>Qlik Talend Cloud</LI> <LI>Qlik Talend Data Integration</LI> </UL> Wed, 01 Apr 2026 10:14:03 GMT https://community.qlik.com/t5/Official-Support-Articles/Qlik-Talend-Cloud-Too-many-bad-authentication-attempts-Too-many/ta-p/2545970 Chethankumar_JS 2026-04-01T10:14:03Z