"Michael Molz" <michael.m...@iwm-software.de> writes:
> we´re running PostgreSQL 8.4.7 for an CRM System on a Linux machine. 
> Database contains about 540 tables with summary about 2.5 million records. 
> Since this weeks the backup stops with an error message always at the same 
> table. It´s irrelevant what tool we use to backup (pgAdmin III, pg_dump from 
> a windows client; backup on the Linux machine directly, ...), error stays the 
> same.

> The log contains the following lines:
> 2011-04-05 17:57:35 CEST LOG:  SSL-error: unsafe legacy renegotiation disabled

That looks like your problem --- the SSL library is breaking the connection.

> Furthermore, I found a hint to the SSL connection problem. It was recommended 
> to add the parameter ssl_renegotiation_limit with value 0 to postgresql.conf 
> to turn off the SSL renegotiation. As I do this, database system will not 
> start again.

And that's the solution (at least till you can get hold of a non-broken
SSL library).  What do you mean by "database system will not start"?
An 8.4.7 server should definitely accept that parameter.

                        regards, tom lane

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