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I’d second the MTU problem, especially if frame 13 in the capture (the 1514 one) has DF set.
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<div class="">Assuming this was taken at the remote CUCM, the retransmitted packets at the bottom are all 1514 bytes, so it’s very likely whatever frame 13 was never received by PLM. </div>
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- Ryan Ratliff</div>
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<div class="">On Dec 21, 2018, at 1:51 PM, Brian Meade <<a href="mailto:bmeade90@vt.edu" class="">bmeade90@vt.edu</a>> wrote:</div>
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<div dir="ltr" class="">One thing to start looking at would be why the TLS Client Hello from PLM is showing as malformed. There's some large packets in there as well (1482 and 1514). I'd bet you've got an MTU issue somewhere on the path.
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<div class="">Was the capture taken from the CUCM side? I would bet it does since it's sending 1514 byte packets and those are the ones you're not getting Acks from PLM on.</div>
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<div dir="ltr" class="">On Fri, Dec 21, 2018 at 12:17 PM Anthony Holloway <<a href="mailto:avholloway%2Bcisco-voip@gmail.com" class="">avholloway+cisco-voip@gmail.com</a>> wrote:<br class="">
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<div dir="ltr" class="">To echo what Brian is saying with his question: 443 is a server listening port (HTTPS), and therefore, the port on PLM talking to it, is an ephemeral client port, or random port, and wouldn't be documented anywhere.
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<div class="">This is similar to the whole UAS/UAC discussion with SIP and 5060.</div>
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<div class="">Take this Outbound call for example, where my CUBE (UAS) is talking SIP with CUCM (UAC) (10.10.10.10) on CUCM's port 50124</div>
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<div class=""><font face="monospace, monospace" class="">PeerAddress=+16125551212</font></div>
<div class=""><font face="monospace, monospace" class="">PeerId=2100</font></div>
<div class=""><span style="background-color:rgb(255,242,204)" class=""><font face="monospace, monospace" class="">RemoteSignallingIPAddress=10.10.10.10</font></span></div>
<div class=""><span style="background-color:rgb(255,242,204)" class=""><font face="monospace, monospace" class="">RemoteSignallingPort=50124</font></span></div>
<div class=""><font face="monospace, monospace" class="">RemoteMediaIPAddress=10.20.20.20</font></div>
<div class=""><font face="monospace, monospace" class="">RemoteMediaPort=28326</font></div>
<div class=""><font face="monospace, monospace" class="">tx_DtmfRelay=rtp-nte</font></div>
<div class=""><font face="monospace, monospace" class="">VAD = disabled</font></div>
<div class=""><font face="monospace, monospace" class="">CoderTypeRate=g711ulaw</font></div>
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<div class="">And then this Inbound call example, where my CUBE (UAC) is talking SIP with CUCM (UAS) (10.10.10.10) on CUCM's port 5060</div>
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<div class=""><font face="monospace, monospace" class="">PeerAddress=+16215551212</font></div>
<div class=""><font face="monospace, monospace" class="">PeerId=2200</font></div>
<div class=""><span style="background-color:rgb(255,242,204)" class=""><font face="monospace, monospace" class="">RemoteSignallingIPAddress=10.10.10.10</font></span></div>
<div class=""><span style="background-color:rgb(255,242,204)" class=""><font face="monospace, monospace" class="">RemoteSignallingPort=5060</font></span></div>
<div class=""><font face="monospace, monospace" class="">RemoteMediaIPAddress=10.20.20.20</font></div>
<div class=""><font face="monospace, monospace" class="">RemoteMediaPort=28524</font></div>
<div class=""><font face="monospace, monospace" class="">tx_DtmfRelay=rtp-nte</font></div>
<div class=""><font face="monospace, monospace" class="">VAD = disabled</font></div>
<div class=""><font face="monospace, monospace" class="">CoderTypeRate=g711ulaw</font></div>
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<div class=""><i class="">PS I get that output from the following command on CUBE: show call active voice | in PeerAddr|PeerId|RemoteS|RemoteM|Dtmf|Coder|VAD</i><br class="">
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<div class="">Put that in an alias command, and you're a few short keystrokes away from some sexy data.</div>
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<div class="">Now, back to the TCP re-transmissions, this is most likely a lower layer issue, and not a problem with PLM/CUCM.</div>
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<div class="">A quick google search resulted in this article, which I found well written, but does go deep, with links to other articles which take you even deeper:</div>
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<div class=""><a href="https://www.netcraftsmen.com/application-analysis-using-tcp-retransmissions-part-1/" target="_blank" class="">https://www.netcraftsmen.com/application-analysis-using-tcp-retransmissions-part-1/</a><br class="">
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<div class="">Since you have the same PLM talking to multiple CUCM clusters, and only a problem with one cluster (or so it sounded like), I'd wager this problem is not with the PLM side, but is probably on the network path where it begins to be unique for this
CUCM cluster in question, to include the CUCM cluster (or more specifically, the Publisher) itself.</div>
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<div class="">As for logs, I'd imagine it wont show you anything more valuable than your packet capture; that's probably pretty telling.</div>
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<div class="">Good luck. I'm curious to see how this turns out.</div>
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<div dir="ltr" class="">On Fri, Dec 21, 2018 at 10:08 AM Brian Meade <<a href="mailto:bmeade90@vt.edu" target="_blank" class="">bmeade90@vt.edu</a>> wrote:<br class="">
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<div dir="ltr" class="">Are you sure the destination port is 56648 and it's not the source port in that handshake?</div>
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<div dir="ltr" class="">On Fri, Dec 21, 2018 at 10:51 AM Jason Aarons (Americas) <<a href="mailto:jason.aarons@dimensiondata.com" target="_blank" class="">jason.aarons@dimensiondata.com</a>> wrote:<br class="">
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<p class="MsoNormal">Have a centralized Prime License Manager (PLM) for several clusters. One cluster the Product Instance shows “Unknown error”. We have firewalls between PLM and clusters.<u class=""></u><u class=""></u></p>
<p class="MsoNormal"><u class=""></u> <u class=""></u></p>
<p class="MsoNormal">I hit Test Connection in PLM and see traffic from source PLM coming in to remote cluster on TCP/443 and then I see traffic back source TCP/443 to destination TCP/56648 and then lots of TCP retransmissions. The GUI in PLM says “Test Connection
Failed.The cause of the error is unknown. Check the Cisco Prime License Manager log for details.”<u class=""></u><u class=""></u></p>
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<p class="MsoNormal">I can’t find in the Port Usage guide where TCP/56648 is documented? What log file do I look at via RTMT on PLM?<u class=""></u><u class=""></u></p>
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<p class="MsoNormal"><u class=""></u> <u class=""></u></p>
<p class="MsoNormal">Jason Aarons, CCIEx2 No. 38564<u class=""></u><u class=""></u></p>
<p class="MsoNormal">Advanced Technology Consultant<u class=""></u><u class=""></u></p>
<p class="MsoNormal">Dimension Data<u class=""></u><u class=""></u></p>
<p class="MsoNormal">904-338-3245<u class=""></u><u class=""></u></p>
<p class="MsoNormal"><u class=""></u> <u class=""></u></p>
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