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When looking at the failed OSG VMU tests on xrootd-5.0.0-rc2 I found that for some reason that pss.origin was getting a random letter prepended to its value and thus, the cache was failing to send requests to the origin. In the test I was looking, the configuration was [1] and the logs showed this [2], you can see that "localhost" gets prepended with an 'l' given as a result 'llocalhost'
As a test, I changed the pss.origin to be "ocalhost" so that the extra 'l' will complete the name and it worked.
Then I tried in a different setup (not in the VMU tests but in a container I use for my own tests) and found a similar behavior. In this case the configuration was [3] and the logs[4]. You can see that In this second case the random letter is 'u'
[1]
pss.origin localhost:$(OriginAuthXrootPort)
[2]
Name or service not known
[2020-04-08 13:00:41.679038 -0500][Error ][PostMaster ] [u157@llocalhost:1095] Unable to resolve IP address for the host
[2020-04-08 13:00:41.679066 -0500][Error ][XRootD ] [u157@llocalhost:1095] Unable to send the message kXR_open (file: /osgtest/PUBLIC/testfile2?oss.lcl=1&pss.tid=root.7614:[log in to unmask], mode: 00, flags: kXR_open_read kXR_async kXR_retstat ): [FATAL] Invalid address
200408 13:00:41 6961 ofs_open: root.7614:[log in to unmask] Unable to open /osgtest/PUBLIC/testfile2; no route to host
200408 13:00:41 6961 root.7614:[log in to unmask] XrootdResponse: sending err 3005: Unable to open /osgtest/PUBLIC/testfile2; no route to host
[3]
```pss.origin redirector.t2.ucsd.edu:1094```
[4]
```200408 23:54:51 814 acc_Audit: ddavila.1360246:[log in to unmask] grant gsi /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=ddavila/CN=815177/CN=Diego Davila [log in to unmask] read /store/user/ddavila/xcc/all_compression.root
[2020-04-08 23:54:51.804942 +0000][Error ][Utility ] Unable to resolve uredirector.t2.ucsd.edu:1094: Name or service not known
[2020-04-08 23:54:51.804999 +0000][Error ][PostMaster ] [[log in to unmask]:1094] Unable to resolve IP address for the host
[2020-04-08 23:54:51.805032 +0000][Error ][XRootD ] [[log in to unmask]:1094] Unable to send the message kXR_open (file: /store/user/ddavila/xcc/all_compression.root?oss.lcl=1&pss.tid=ddavila.1360246:[log in to unmask], mode: 00, flags: kXR_open_read kXR_async kXR_retstat ): [FATAL] Invalid address
200408 23:54:51 814 ofs_open: ddavila.1360246:[log in to unmask] Unable to open /store/user/ddavila/xcc/all_compression.root; no route to host
200408 23:54:51 814 ddavila.1360246:[log in to unmask] XrootdResponse: sending err 3005: Unable to open /store/user/ddavila/xcc/all_compression.root; no route to host
—
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