SRT: Processing error in Internet Communication Framework: (“ICF Error when receiving the response: ICM_HTTP_CONNECTION_FAILED”)

SRT: Processing error in Internet Communication Framework: (“ICF Error when receiving the response: ICM_HTTP_CONNECTION_FAILED”)
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While integrating two systems SAP to SAP or non-SAP to SAP, you can frequently see ICM_HTTP_CONNECTION_FAILED error in webservice monitoring transactions like SXMB_MONI,SRT_UTIL or SBGRFCMON according to integration type. This error mostly caused by lack of access rights between two systems. For example your SAP system related port which is accessed by message sender system must be opened by network team.
Recently we have faced with this error but in a weird case. That is, the error was thrown not in all messages but one fourth of coming messages. Upon that i have checked both ip/port access rights. But everything seems fine. Then i realized that we have five application server which all servers have different ip adresses. Then we asked network team to grant access for each ip/port combination. It has solved our issue.

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