Client server is getting exceptions when trying to access F5 VIP.

Hi Muhammad, are you observing simultaneous log messages in the /var/log/ltm facility? Recent logs can be viewed via "zcat". Due to the log rotation logs of last 10 days are kept, as you probably know. As it is an error on the client it´s hard to tell, what it actually means. Perhaps the developer of the client software can explain potential reasons. The "couldn´t send message" log indicates the request is not forwarded to the target server. If the /var/log/ltm reports a simultaneous pool member state change or a "http header size exceeded" we would have an explanation. Duplicated headers may be another reason depending on the iRule logic. Thanks, Stephan