Thanks for your report. My guess is that the accesses you see are done by NSS as libcurl has no code for actions like that.

What exactly are you saying the bug is?

Also, if the old libcurl indicates anything you also probably use an old NSS version so chances are more modern versions act differently.

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** [bugs:#1246] curl + nss seaches ._dOeSnotExist_ .[0-9]\{10\}.db files in /etc/pki/nssdb/**
**Status:** open
**Labels:** nss https 
**Created:** Fri Jun 14, 2013 12:53 AM UTC by Antony Lem
**Last Updated:** Fri Jun 14, 2013 12:53 AM UTC
**Owner:** Daniel Stenberg
I noticed strange behavior of curl + nss when I tried to connect with https.
During the connection strace showed me follows 
access("/etc/pki/nssdb/._dOeSnotExist_1012323634.db", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/pki/nssdb/._dOeSnotExist_1012323635.db", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/pki/nssdb/._dOeSnotExist_1012323636.db", F_OK) = -1 ENOENT (No such file or directory)
There was 645 such string and it happened every time I started connection.I confused why curl is searching such unusual files.
OS:CentOS release 6.4 (Final)
curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.13.6.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
Protocols: tftp ftp telnet dict ldap ldaps http file https ftps scp sftp 
Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz
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