LoadModule mod_ssl modules/mod_ssl.so shows error message at server startup

apache-2.2

I need to add SSL module into Httpd Server. So, I created mod_ssl.so file by compiling the SSL module source code, with the help of apxs. I used command "apxs -c mod_ssl.c". I added the string "LoadModule mod_ssl modules/mod_ssl.so" into the httpd.conf file.

When I start the server I got the error message –

httpd: Syntax error on line 57 of /Users/gauravgoel/Apache-HttpServer/httpdBuild-2.2.16/httpdInstall-2.2.16/conf/httpd.conf: Cannot load /Users/gauravgoel/Apache-HttpServer/httpdBuild-2.2.16/httpdInstall-2.2.16/modules/mod_ssl.so into server: dlopen(/Users/gauravgoel/Apache-HttpServer/httpdBuild-2.2.16/httpdInstall-2.2.16/modules/mod_ssl.so, 10): Symbol not found: _ssl_callback_TmpDH\n  Referenced from: /Users/gauravgoel/Apache-HttpServer/httpdBuild-2.2.16/httpdInstall-2.2.16/modules/mod_ssl.so\n  Expected in: flat namespace\n in /Users/gauravgoel/Apache-HttpServer/httpdBuild-2.2.16/httpdInstall-2.2.16/modules/mod_ssl.so

Can you please help me?

Thanks

Best Answer

This is most likely because apache cannot find the libssl.so dynamic library. On a Linux system, look at the man page for ldconfig and see if your openssl library in the dynamic linker path with ldconfig -p. On Solaris, look at the man page for crle to see what your runtime linker environment is.

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Compiling Apache mod_ssl for different target hardware (hardware capability unsupported SSE2 error)

Here are the steps that I have done to successfully build and install the Apache httpd-2.4.10 and OpenSSL openssl-1.0.1j on Solaris 10.

Download following software
openssl-1.0.1j.tar.gz
httpd-2.4.10.tar.gz
apr-1.5.1.tar.gz
apr-util-1.5.4.tar.gz
pcre-8.36.tar.gz
Verify Make and CC
By default gcc is at /usr/sfw/bin/gcc and make is at /usr/ccs/bin/make

Include following in the PATH
usr/local/ssl/bin:/usr/sfw/bin:/usr/local/bin:/usr/ccs/bin

Include following in the LD_LIBRARY_PATH
/usr/local/lib:/usr/local/ssl/lib
Build and install openssl-1.0.1j
Unzip and un-tar openssl-1.0.1j.tar.gz to /usr/local/openssl-1.0.1j
Execute following commands in order. The shared parameter is very important so that it can be linked with httpd-2.4.10 build for SSL enabling.
```
$ cd /usr/local/openssl-1.0.1j
$ ./config shared
$ make
$ make test
$ make install
```
By default it installs openssl at /usr/local/ssl
Install pcre-8.36 Unzip and un-tar pcre-8.36.tar.gz to /usr/local/ pcre-8.36

Execute following commands in order
```
$ cd /usr/local/ pcre-8.36
$ ./configure 
$ make
$ make install
```
By default, make install installs the package's commands under /usr/local/bin, include files under /usr/local/include, etc.
Build and install httpd-2.4.10

Unzip and un-tar httpd-2.4.10.tar.gz to /usr/local/httpd-2.4.10

Unzip and un-tar apr-1.5.1.tar.gz to /usr/local/httpd-2.4.10/srclib
Rename /usr/local/apr-1.5.1 to /usr/local/apr

Unzip and un-tar apr-util-1.5.4.tar.gz to /usr/local/httpd-2.4.10/srclib
Rename /usr/local/apr-util to /usr/local/apr-util

Execute following commands in order
```
$ ./configure --prefix=/usr/local/apache2 --with-included-apr --enable-so –enable-ssl=shared --with-ssl=/usr/local/ssl
$ make
$ make install
```
It installs it at /usr/local/apache2

The installation is complete. To enable SSL and Proxy, update /usr/local/apache2/conf/httpd.conf with uncommentting following lines

LoadModule socache_shmcb_module modules/mod_socache_shmcb.so

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so
LoadModule proxy_scgi_module modules/mod_proxy_scgi.so
LoadModule proxy_wstunnel_module modules/mod_proxy_wstunnel.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule proxy_express_module modules/mod_proxy_express.so

LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
LoadModule ssl_module modules/mod_ssl.so

Include conf/extra/httpd-ssl.conf

Now you can work on httpd-ssl.conf as you usually do to complete your configuration

Linux – Can’t start apache in linux, because of proxy module

Make sure there is a line to load proxy_module in httpd.conf:

LoadModule proxy_module modules/mod_proxy.so

And make sure that that file exist and has reasonable permissions.

Best Answer

Related Solutions

Compiling Apache mod_ssl for different target hardware (hardware capability unsupported SSE2 error)

Linux – Can’t start apache in linux, because of proxy module

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