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Back to Troubleshooting Guide
Unknown error ... Communication error on send
Full message
$ lcg-cr -v --vo ops file:/etc/group -d some-dpm.some-domain Using grid catalog type: lfc Using grid catalog : prod-lfc-shared-central.cern.ch Using LFN : /grid/ops/generated/2007-10-01/file-714ebdda-131c-42dc-b87e-e78e80a36485 Using SURL : srm://some-dpm.some-domain/dpm/some-domain/home/ops/generated/2007-10-01/..... httpg://some-dpm.some-domain:8443/srm/managerv1: Unknown error lcg_cr: Communication error on send
Diagnosis 1
For a DPM this error occurs when its gridftp server has no free pool accounts for the VO: add more accounts, with the corresponding empty files in /etc/grid-security/gridmapdir.
Diagnosis 2
The problem may not be because of a lack of free accounts but lack of appropriate mapping. Check the user mapping by doing something like:
$ cd /etc/grid-security/gridmapdir $ ls -li *name* 4807892 -rw-r--r-- 2 root root 0 Oct 16 13:57 %2fc%3duk%2fo%3descience%2fou%3dcambridge%2fl%3ducs%2fcn%3dname%20second $ ls -li | grep 4807892 4807892 -rw-r--r-- 2 root root 0 Oct 16 13:57 %2fc%3duk%2fo%3descience%2fou%3dcambridge%2fl%3ducs%2fcn%3dname%20second 4807892 -rw-r--r-- 2 root root 0 Oct 16 13:57 dteam001
If the latter command does not show two files than the user is not mapped to any of the pool accounts, hence the "Unknown error". Just delete the empty file with the strange long name and the next time the mapping should be fine again.