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No need to be concerned. Somewhere in between the server and the client it appears the MTU has been adjusted. Typically due to some form of encapsulation which adds headers to the IP packet, or or manual manipulation of an MTU setting, decreasing the size of the MSS. I hope you can get to this URL - https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PN0gCAG