Is this something happening recently? If yes did anything change on that server?
We upgraded from 5.0.0 to 5.0.4 and We changed the kamailio config too. If you need the config, I can send it to you in private.
Which version of libcurl are you using?
``` # ldd /usr/lib/x86_64-linux-gnu/kamailio/modules/http_async_client.so linux-vdso.so.1 => (0x00007ffe69bb4000) libcurl.so.4 => /usr/lib/x86_64-linux-gnu/libcurl.so.4 (0x00007efe31a30000) libevent-2.0.so.5 => /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5 (0x00007efe317ec000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007efe31422000) libidn.so.11 => /usr/lib/x86_64-linux-gnu/libidn.so.11 (0x00007efe311ef000) librtmp.so.0 => /usr/lib/x86_64-linux-gnu/librtmp.so.0 (0x00007efe30fd5000) libssl.so.1.0.0 => /lib/x86_64-linux-gnu/libssl.so.1.0.0 (0x00007efe30d75000) libcrypto.so.1.0.0 => /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 (0x00007efe30999000) libgssapi_krb5.so.2 => /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2 (0x00007efe30752000) liblber-2.4.so.2 => /usr/lib/x86_64-linux-gnu/liblber-2.4.so.2 (0x00007efe30542000) libldap_r-2.4.so.2 => /usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2 (0x00007efe302f1000) libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007efe300d8000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007efe2feb9000) /lib64/ld-linux-x86-64.so.2 (0x0000560728482000) libgnutls.so.26 => /usr/lib/x86_64-linux-gnu/libgnutls.so.26 (0x00007efe2fbfb000) libgcrypt.so.11 => /lib/x86_64-linux-gnu/libgcrypt.so.11 (0x00007efe2f97b000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007efe2f776000) libkrb5.so.3 => /usr/lib/x86_64-linux-gnu/libkrb5.so.3 (0x00007efe2f4ab000) libk5crypto.so.3 => /usr/lib/x86_64-linux-gnu/libk5crypto.so.3 (0x00007efe2f27c000) libcom_err.so.2 => /lib/x86_64-linux-gnu/libcom_err.so.2 (0x00007efe2f077000) libkrb5support.so.0 => /usr/lib/x86_64-linux-gnu/libkrb5support.so.0 (0x00007efe2ee6c000) libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007efe2ec51000) libsasl2.so.2 => /usr/lib/x86_64-linux-gnu/libsasl2.so.2 (0x00007efe2ea35000) libgssapi.so.3 => /usr/lib/x86_64-linux-gnu/libgssapi.so.3 (0x00007efe2e7f7000) libtasn1.so.6 => /usr/lib/x86_64-linux-gnu/libtasn1.so.6 (0x00007efe2e5e3000) libp11-kit.so.0 => /usr/lib/x86_64-linux-gnu/libp11-kit.so.0 (0x00007efe2e3a0000) libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007efe2e19b000) libkeyutils.so.1 => /lib/x86_64-linux-gnu/libkeyutils.so.1 (0x00007efe2df97000) libheimntlm.so.0 => /usr/lib/x86_64-linux-gnu/libheimntlm.so.0 (0x00007efe2dd8d000) libkrb5.so.26 => /usr/lib/x86_64-linux-gnu/libkrb5.so.26 (0x00007efe2db05000) libasn1.so.8 => /usr/lib/x86_64-linux-gnu/libasn1.so.8 (0x00007efe2d863000) libhcrypto.so.4 => /usr/lib/x86_64-linux-gnu/libhcrypto.so.4 (0x00007efe2d630000) libroken.so.18 => /usr/lib/x86_64-linux-gnu/libroken.so.18 (0x00007efe2d41b000) libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6 (0x00007efe2d212000) libwind.so.0 => /usr/lib/x86_64-linux-gnu/libwind.so.0 (0x00007efe2cfe9000) libheimbase.so.1 => /usr/lib/x86_64-linux-gnu/libheimbase.so.1 (0x00007efe2cddb000) libhx509.so.5 => /usr/lib/x86_64-linux-gnu/libhx509.so.5 (0x00007efe2cb91000) libsqlite3.so.0 => /usr/lib/x86_64-linux-gnu/libsqlite3.so.0 (0x00007efe2c8d8000) libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007efe2c69f000) ``` ``` # dpkg -S /usr/lib/x86_64-linux-gnu/libcurl.so.4 libcurl3:amd64: /usr/lib/x86_64-linux-gnu/libcurl.so.4 # apt-cache policy libcurl3 libcurl3: Installed: 7.35.0-1ubuntu2.13 ```