debug Pass-Trough authentication with SASL

Hi,

I run
saslauthd 2.1.26
authentication mechanisms: getpwent kerberos5 rimap shadow ldap

and in my etc/saslauthd.conf I do have
ldap_servers: ldap://example.com:389
which is a round-robin dns (10 IPs behind)

Now I have the problem that sometimes the connection to example.com 
seems to hang:

Jan 18 17:06:15 uit-algo-p-11 slapd[130335]: conn=1410 op=0 BIND 
dn="cn=petert,dc=example,dc=com" method=128
Jan 18 17:06:15 uit-algo-p-11 slapd[130335]: conn=1410 op=0 BIND 
dn="cn=petert,dc=example,dc=com" mech=SIMPLE ssf=0
Jan 18 17:06:15 uit-algo-p-11 slapd[130335]: conn=1410 op=0 RESULT 
tag=97 err=0 text=
Jan 18 17:06:15 uit-algo-p-11 slapd[130335]: conn=1411 fd=15 ACCEPT from 
IP=127.0.0.1:54144 (IP=127.0.0.1:9389)
Jan 18 17:06:15 uit-algo-p-11 slapd[130335]: conn=1411 op=0 BIND 
dn="cn=petert,dc=example,dc=com" method=128
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: conn=1410 op=1 UNBIND
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: conn=1410 fd=14 closed
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: connection_read(14): no 
connection!
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: conn=1408 op=2 UNBIND
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: conn=1408 fd=13 closed
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: connection_read(13): no 
connection!
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: conn=1407 op=1 UNBIND
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: conn=1407 fd=10 closed
Jan 18 17:06:16 uit-algo-p-11 slapd[130335]: connection_read(10): no 
connection!
Jan 18 17:21:49 uit-algo-p-11 saslauthd[131005]: ldap_simple_bind() 
failed -1 (Can't contact LDAP server).
Jan 18 17:21:49 uit-algo-p-11 saslauthd[131005]: Retrying authentication
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: conn=1411 op=0 BIND 
dn="cn=petert,dc=example,dc=com" mech=SIMPLE ssf=0
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: conn=1411 op=0 RESULT 
tag=97 err=0 text=
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: conn=1411 op=1 SRCH 
base="dc=example,dc=com" scope=1 deref=3 filter="(&(uid=petert))"
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: <= mdb_equality_candidates: 
(uid) not indexed
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: conn=1411 op=1 SEARCH 
RESULT tag=101 err=0 nentries=1 text=
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: conn=1412 fd=10 ACCEPT from 
IP=127.0.0.1:54761 (IP=127.0.0.1:9389)
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: conn=1412 op=0 BIND 
dn="cn=petert,dc=example,dc=com" method=128
Jan 18 17:21:49 uit-algo-p-11 saslauthd[131009]: ldap_simple_bind() 
failed -1 (Can't contact LDAP server).
Jan 18 17:21:49 uit-algo-p-11 saslauthd[131009]: Retrying authentication
Jan 18 17:21:49 uit-algo-p-11 slapd[130335]: conn=1412 op=0 BIND 
dn="cn=petert,dc=example,dc=com" mech=SIMPLE ssf=0

The message "ldap_simple_bind() failed -1 (Can't contact LDAP server)." 
is quite common and it looks like I get it every bind.
What I'm now looking for is some help in diagnosis like "to which IP is 
saslauthd now connecting to and trying the bind"

Any hints?
btw: I can't run my openldap and saslauthd as root hence the portnumbers 
 > 1024.

Thanks
Thomas