Service Dispatcher error and debugging output (if enabled) are written to the file dispatcher.log in the PMDF log directory.

Debugging output can be enabled using the option DEBUG in the Dispatcher configuration file, or on a per-process level, via the PMDF_DISPATCHER_DEBUG logical (OpenVMS) or environment variable (UNIX or NT).

The DEBUG option or PMDF_DISPATCHER_DEBUG logical name (OpenVMS) or environment variable (UNIX or NT) defines a 32-bit debug mask in hexadecimal. Enabling all debugging is done by setting the option to -1, or by defining the logical or environment variable system-wide to the value FFFFFFFF. The actual meaning of each bit is described in Table 11-2.

Table 11-2 Dispatcher debugging bits

Bit	Hexadecimal	Decimal	Usage
	value	value
0	x 00001	1	Basic Service Dispatcher main module debugging
1	x 00002	2	Extra Service Dispatcher main module debugging
2	x 00004	4	Service Dispatcher configuration file logging
3	x 00008	8	Basic Service Dispatcher miscellaneous debugging
4	x 00010	16	Basic service debugging
5	x 00020	32	Extra service debugging
6	x 00040	64	Process related service debugging
7	x	128	Not used
8	x 00100	256	Basic Service Dispatcher and process communication debugging
9	x 00200	512	Extra Service Dispatcher and process communication debugging
10	x 00400	1024	Packet level communication debugging
11	x 00800	2048	Not used
12	x 01000	4096	Basic Worker Process debugging
13	x 02000	8192	Extra Worker Process debugging
14	x 04000	16384	Additional Worker Process debugging, particularly connection handoffs
15	x 08000	32768	Not used
16	x 10000	65536	Basic Worker Process to Service Dispatcher I/O debugging
17	x 20000	131072	Extra Worker Process to Service Dispatcher I/O debugging
20	x 100000	1048576	Basic statistics debugging
21	x 200000	2097152	Extra statistics debugging
24	x 1000000	16777216	Log PORT_ACCESS mapping, DNS_VERIFY_DOMAIN, and ENABLE_RBL denials to the dispatcher.log file