LDAP Issues B4 errors

Hi guys,

 

We do have a vip for our SUNONE LDAP, the is set as performance layer 4 everything is default, load balancing method is least connection members, health monitor is just a regular TCP-636 monitor. We also used src address persistence. now the issue is according to LDAP team they are getting B4 errors on their server please check below

 

[21/Apr/2016:15:57:20 -0700] conn=15521 op=0 msgId=-1 - closing from 172.21.16.253:59444 - B4 - Server failed to flush BER data back to client -

 

[21/Apr/2016:15:57:21 -0700] conn=15527 op=0 msgId=-1 - closing from 172.21.16.253:54789 - B4 - Server failed to flush BER data back to client -

 

according to ORACLE site B4 errors is

 

The server failed to flush data response back to client. This code can occur when the client closes the connection to the server, before the server finished sending data to the client.

 

so my question is, is the LTM terminating the session before the ldap server responded? we might need to adjust the fastL4 protocol settings? also on the performance L4 VS, what does this VS uses for protocol connecting to the server? on the f5 web admin fastL4 protocol is used on the client side is the LTM used the same protocol on the server side as well? thanks