Plex Media Server Logs filled with repetitive error

Server Version#: 1.19.5.3112
Player Version#: n/a

I am seeing lots of errors trying to parse SSPD data in the log, It repeats constantly…

[2068] ERROR - SSDP: Error parsing device schema for http:/ x.y.x.104:8080/upnp
[0228] WARN - Got a transcode session ping without a session GUID (or with an invalid one).

I have a Unifi Cloudkey Controller on x.y.z.104 which controls my WiFi network. My unifi controller does host a website on 8080 but there is not page at :8080/upnp (404).

Aug 25, 2020 09:23:19.380 [4444] INFO - Plex Media Server v1.19.5.3112-b23ab3896 - Microsoft PC x64 - build: windows-x86 windows - GMT -04:00
Aug 25, 2020 09:23:19.380 [4444] INFO - Windows version: 10.0 (Build 18363), language en-US
Aug 25, 2020 09:23:19.380 [4444] INFO - 8 2394 MHz processor(s): Architecture=0, Level=6, Revision=9473 Processor Identifier=Intel64 Family 6 Model 37 Stepping 1, GenuineIntel
Aug 25, 2020 09:23:20.016 [3216] INFO - OCSP: Successfully retrieved response from cache.
Aug 25, 2020 09:23:26.394 [3400] WARN - Got a transcode session ping without a session GUID (or with an invalid one).
Aug 25, 2020 09:23:26.400 [3400] ERROR - Unknown metadata type: folder
Aug 25, 2020 09:23:27.301 [7588] INFO - AutoUpdate: no updates available
Aug 25, 2020 09:23:27.893 [4016] WARN - Held transaction for too long (..\Library\MetadataCollection.cpp:250): 0.234375 seconds
Aug 25, 2020 09:23:29.305 [8228] WARN - Sync: sync list 42443679 belonging to user 29938730 (mrs.kight79@gmail.com) has died of old age, ignoring
Aug 25, 2020 09:23:29.309 [8228] INFO - Sync: downloaded 2 sync list(s) with 1 sync items(s): 0 new, 0 updated, 0 deleted
Aug 25, 2020 09:23:29.324 [0228] WARN - MyPlex: attempted a reachability check but were not yet online.
Aug 25, 2020 09:23:32.431 [4452] ERROR - Error issuing curl_easy_perform(handle): 28
Aug 25, 2020 09:23:32.976 [0228] INFO - AutoUpdate: no updates available
Aug 25, 2020 09:23:35.571 [1200] INFO - Refreshing paths watched by LibraryUpdateManager
Aug 25, 2020 09:23:36.177 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:23:38.739 [1276] ERROR - Error issuing curl_easy_perform(handle): 28
Aug 25, 2020 09:23:38.759 [1100] INFO - [PlexRelay] Allocated port 6865 for remote forward to 127.0.0.1:32401
Aug 25, 2020 09:23:40.100 [7860] ERROR - Unknown metadata type: 
Aug 25, 2020 09:23:40.322 [4220] ERROR - Unknown metadata type: 
Aug 25, 2020 09:23:43.707 [4820] INFO - AutoUpdate: no updates available
Aug 25, 2020 09:23:44.972 [4572] ERROR - Error issuing curl_easy_perform(handle): 28
Aug 25, 2020 09:23:44.972 [7216] ERROR - Error issuing curl_easy_perform(handle): 28
Aug 25, 2020 09:23:47.415 [6372] WARN - Got a transcode session ping without a session GUID (or with an invalid one).
Aug 25, 2020 09:23:49.013 [0228] INFO - AutoUpdate: no updates available
Aug 25, 2020 09:23:49.975 [9584] ERROR - Error issuing curl_easy_perform(handle): 28
Aug 25, 2020 09:23:49.975 [9356] ERROR - Error issuing curl_easy_perform(handle): 28
Aug 25, 2020 09:23:49.975 [7308] ERROR - Error issuing curl_easy_perform(handle): 28
Aug 25, 2020 09:23:54.974 [7860] WARN - Connection Tester: Error testing media server free-entertainment in 10000 ms.
Aug 25, 2020 09:23:55.177 [2032] ERROR - Unknown metadata type: 
Aug 25, 2020 09:23:57.896 [2032] ERROR - Error issuing curl_easy_perform(handle): 3
Aug 25, 2020 09:23:57.896 [2032] WARN - HTTP error requesting GET /media/providers (3, URL using bad/illegal format or missing URL) ()
Aug 25, 2020 09:24:06.180 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:24:17.361 [0228] WARN - Got a transcode session ping without a session GUID (or with an invalid one).
Aug 25, 2020 09:24:36.181 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:24:47.286 [0228] WARN - Got a transcode session ping without a session GUID (or with an invalid one).
Aug 25, 2020 09:25:06.184 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:25:17.274 [0228] WARN - Got a transcode session ping without a session GUID (or with an invalid one).
Aug 25, 2020 09:25:36.189 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:25:47.391 [0228] WARN - Got a transcode session ping without a session GUID (or with an invalid one).
Aug 25, 2020 09:26:06.193 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:26:17.384 [0228] WARN - Got a transcode session ping without a session GUID (or with an invalid one).

They do but should be harmless. They are not thousands a second but few every x seconds.

We do SSDP searches periodically and devices on the network respond - some may be returning invalid data

Aug 25, 2020 09:25:06.184 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:25:36.189 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp
Aug 25, 2020 09:26:06.193 [2068] ERROR - SSDP: Error parsing device schema for http://x.y.x.104:8080/upnp

This log extract shows 30 second gap between them - so not an issue - part of normal operation

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