Micros 3700 5.5MR3 Room posting Timeout error

[POSN]

Hello,
We just installed a fresh server that interfaces with Opera PMS for room charges. Upon posting payment, an error appears saying "RECEIVE TIMEOUT" and posting is completed. The payment is made regardless of the error.

We have replaced the ISL file with different versions. We have settled the with 37FO_540 (5.4).
Has anyone else seen this or know what the resolution is?
Thanks in advance.

 

[POSN]

A little more information:
Re-opening the check and voiding the pms payment does not generate the error. Reprinting the check does generate the same error. There was no interaction between reprinting the check and the pms interface.