Postfix table lookup problem + ISPConfig login

My Perfect Server (Debian 6) worked fine about a year... from two days ago user can't access the mail server (Postfix + Dovecot)

Now the log says:

Code:

Apr 11 08:05:33 ts102986 postfix/master[4628]: warning: process /usr/lib/postfix/trivial-rewrite pid 5180 exit status 1
Apr 11 08:05:33 ts102986 postfix/master[4628]: warning: /usr/lib/postfix/trivial-rewrite: bad command startup -- throttling
Apr 11 08:05:33 ts102986 postfix/smtpd[4995]: warning: problem talking to service rewrite: Success
Apr 11 08:05:33 ts102986 postfix/smtpd[4996]: warning: problem talking to service rewrite: Connection reset by peer
Apr 11 08:05:33 ts102986 postfix/master[4628]: warning: process /usr/lib/postfix/trivial-rewrite pid 5181 exit status 1
Apr 11 08:06:33 ts102986 postfix/proxymap[4632]: warning: connect to mysql server 127.0.0.1: Access denied for user 'ispconfig'@'localhost' (using password: YES)
Apr 11 08:06:33 ts102986 postfix/proxymap[4632]: warning: connect to mysql server 127.0.0.1: Access denied for user 'ispconfig'@'localhost' (using password: YES)
Apr 11 08:06:33 ts102986 postfix/trivial-rewrite[5213]: fatal: proxy:mysql:/etc/postfix/mysql-virtual_domains.cf(0,lock|fold_fix): table lookup problem
Apr 11 08:06:33 ts102986 postfix/trivial-rewrite[5214]: fatal: proxy:mysql:/etc/postfix/mysql-virtual_domains.cf(0,lock|fold_fix): table lookup problem
Apr 11 08:06:34 ts102986 postfix/qmgr[4630]: warning: problem talking to service rewrite: Interrupted system call
Apr 11 08:06:34 ts102986 postfix/master[4628]: warning: process /usr/lib/postfix/trivial-rewrite pid 5213 exit status 1
Apr 11 08:06:34 ts102986 postfix/master[4628]: warning: /usr/lib/postfix/trivial-rewrite: bad command startup -- throttling
Apr 11 08:06:34 ts102986 postfix/smtpd[4954]: warning: problem talking to service rewrite: Connection reset by peer
Apr 11 08:06:34 ts102986 postfix/smtpd[4996]: warning: problem talking to service rewrite: Success
Apr 11 08:06:34 ts102986 postfix/master[4628]: warning: process /usr/lib/postfix/trivial-rewrite pid 5214 exit status 1
Apr 11 08:06:34 ts102986 postfix/smtpd[4995]: warning: problem talking to service rewrite: Connection reset by peer

I read in the forum all about this kind of error, but nothing helped me.
MySQL seems to work fine (netstat -tap, command line, phpmyadmin)
Password seems correct in the ispconfig config and in the postfix/mysql-virtual*.cf

In the past weeks I needed to open mysql server to another host so I had to change the bind-address, now is back to 127.0.0.1

Trying to update manually ISPConfig, reconfiguring services, now I can't login (Username or Password empty)